You know you overbuilt your rocket when...

[Prof. Endwalker]

...your spacecraft has it's own atmosphere, moons, civilization, and worshipers.

[Deadpangod3]

...your spacecraft has it's own atmosphere, moons, civilization, and worshipers.

...

*looks down*

[xXIndestructibleEVAXx]

when the 2nd stage of your launcher converts the Milky Way's worth of energy...

and the first stage uses the Virgo Supercluster's worth...

[megatiger78]

when you realise this belongs in forum games....

[Deadpangod3]

when you realise this belongs in forum games....

when you realise it actualy involves ksp and therefore does belong here.

[elfnet]

When you complete all science and missions and still do not have enough funds to launch it.

[Red Iron Crown]

... you have to lower your side boosters because of Kerbin's curvature.

[Stilgar2300]

You know you over Biltmore when after launch your computer files a restraining order against you

[temporalExile]

When you use Alcubierre drives as RCS

[impwarhamer]

When you use your orbital insertion stage as the transfer and landing stage, not just because you can but because you realise your actual landing stage is broken.

[MoreUmpf]

When you can't afford your rocket anymore.

[cantab]

When you can't afford your rocket anymore.

In Sandbox mode.

[Bill Phil]

When a black hole spits it out and says, " Nope!"

[Jovus]

When the prospect of launching it makes you decide to play something else.

[Hello moto]

When your PC promptly decides to download dozens of the most destructive viruses and die than have to deal with a launch

[Alchemist]

When your launch sequence is:

1) Engage SAS and launch

2) go make yourself tea

3) press space to decouple the solid boosters

4) make the sandwiches and have the breakfast

5) gently start gravity turn

6) find yourself something to read while stabilizing rocket's attitude

...

by the time you reach orbit you've finished the book and eaten your dinner

[Hary R]

Well wen you decide to try you new SSTO and it achieve escape velocity before leaving the atmosphere (30 000 m) .

Edited November 29, 2014 by Hary R

[SunJumper]

Even better -- When your rover test destroys the launchpad, VAB and mission control...

When your rover test destroys Kerbin

When you need to build a notch in the side of your rocket so it fits round the VAB when you launch it.

When your rocket is so big you have to put it over the whole KSC.

When your TWR is > 10.

When your TWR is 100... on a neutron star.

When you launch it and it blows the windows out of mission control

When you launch it and it blows out Mission Control... and the rest of KSC... and the rest of Kerbin...

When your Gilly lander has enough fuel to do a GT minus Eve and Jool landing.

When your Gilly Lander has enough fuel to land on the Sun. And then do a full Grand Tour... five times.

Scratch that, when your Gilly Lander is so large, Gilly itself lands on it.

...your spacecraft has it's own atmosphere, moons, civilization, and worshipers.

...your spacecraft has its own galaxy.

...

*looks down*

When you basically turned Kerbin into your rocket.

when the 2nd stage of your launcher converts the Milky Way's worth of energy...

and the first stage uses the Virgo Supercluster's worth...

When your upper stage creates a big bang.

When you complete all science and missions and still do not have enough funds to launch it.

When you edit the amount of funds you have, to the largest possible number that can be put there... and still can't launch your rocket.

... you have to lower your side boosters because of Kerbin's curvature.

You have to lower the ground because of your rocket's gravity.

When you use Alcubierre drives as RCS

When you use supernovae as RCS

When you use your orbital insertion stage as the transfer and landing stage, not just because you can but because you realise your actual landing stage is broken.

When you use your launch stage to land on Eve. And return. And go back to Eve. And return again.

When you can't afford your rocket anymore.

In Sandbox mode.

In version 0.7.3

When a black hole spits it out and says, " Nope!"

When your rocket spits out a black hole.

When the prospect of launching it makes you decide to play something else.

When you launch it and your PC immediately deletes KSP.

When your PC promptly decides to download dozens of the most destructive viruses and die than have to deal with a launch

When your PC has a panic attack and launches a stock craft instead.

When your launch sequence is:

1) Engage SAS and launch

2) go make yourself tea

3) press space to decouple the solid boosters

4) make the sandwiches and have the breakfast

5) gently start gravity turn

6) find yourself something to read while stabilizing rocket's attitude

...

by the time you reach orbit you've finished the book and eaten your dinner

When your launch sequence is:

1) Press launch

2) Die of old age

Well wen you decide to try you new SSTO and it achieve escape velocity before leaving the atmosphere (30 000 m) .

When you try your new SSTO and it reaches the speed of light in the first frame.

[theend3r]

When it costs over a few millon funds to launch

[worir4]

When you use the VAB it self as a fuel tank for your rocket becuase nothing else was big enough..

[Red Iron Crown]

When its topographic prominence is greater than any mountain on the continent.

[BrotatoSalad]

You get banned from the forums for repetitively asking about when Squad will add 100 meter diameter fuel tanks.

[Coga19000]

Not sure if it counts, but I do remember getting a lander to Minmus with the last stage of the lifter (non-nuclear), then also landing with it. It was a soft landing, and the lifter still had Delta-v to return to orbit, but I decoupled it anyways when it toppled over (it was not designed to be used this way) After a series of suborbital hops, the last of them broke my lander engine, so I decoupled the fuel tank and returned to Kerbin on RCS power

[Hello moto]

When your manned Mun fly-by ends up being your first ever landing on Eve.

[Steambirds]

You get banned from the forums for repetitively asking about when Squad will add 100 meter diameter fuel tanks.

You get banned from the forums for repetitively asking for 100 meter radius fuel tanks.