You know you overbuilt your rocket when...

[Deadpangod3]

you land the docking stage back on kerbin with only the engine and RCS (provided i used the atmosphere to slow me down then suicide burned the rest of the way) even after staging an entire stage full of fuel.

list your overbuilt rockets here!

[Benaiah]

...you use the last part of your lifter to make the transfer burn.

[tetryds]

...you land on Mün on the top of your NERVA with an almost full tank.

[McFarnsworth]

...you use the last part of your lifter to make the transfer burn.

... and the circularization burn, ... and part of the landing burn, ... and you only stage because this part of the rocket was never meant to land.

[tetryds]

... and the circularization burn, ... and part of the landing burn, ... and you only stage because this part of the rocket was never meant to land.

...or land on it anyway, and use it to go back to orbit, haha.

[Starman4308]

...your Munar landing legs fry on the aerobrake home, courtesy of Deadly Reentry.

[Deadpangod3]

...your Karbonite rocket has enough fuel to reach the mun, land, and return in one stage.

[Red Iron Crown]

...you land at KSC after a successful mission with three stages remaining.

[cantab]

Your interplanetary trajectories are straight lines.

[technicalfool]

...you measure your gameplay in seconds per frame.

[LethalDose]

... Your rockets don't look like rockets.

[Javster]

You use your Mun descent stage for descent, ascent, transfer back to Kerbin, and landing.

[temporalExile]

When your booster's boosters need boosters

[worir4]

When you use the NASA pack SRBs as sepatrons for your lifter.

[I_Killed_Jeb]

When you use the NASA pack SRBs as sepatrons for your lifter.

pics??

[Overfloater]

...when there's atomic RCS thrusters on it.

[Technical Ben]

When your booster's boosters need boosters

In addition to boosters for separators!

[edit]

Beaten by worir4, so a new one...

... when your Jool transfer craft is so big, you decide to just send the engine block on it's own, leaving the main stage as a fuel depot, as that's all you really needed to get there!

Edited November 7, 2014 by Technical Ben

[GreeningGalaxy]

When you have seven-figure delta-V.

[KerikBalm]

When you turn your Mun science harvester into a mission to Jool, after multiple landings on biomes (granted, no landing on Tylo or Laythe are planned for that one, although Laythe aerobraking is planned).

My fuel depot/mothership contained way more fuel than needed... sending it on to minmus seemed so boring

[temporalExile]

When you have seven-figure delta-V.

^This. For some reason I feel the need to give all of my probes 5 figure Delta-V numbers, even If its never supposed to leave Kerbin's orbit. In fact, I have a communications satillite in geostationary orbit right now with about 11Km/s of delta-V left.

[Vaporo]

When you land on Duna on your way to Jool to relieve the monotony of interplanetary transfer.

[worir4]

When during a grand tour you stop of to the surface of Eve for Ice cream twice! Bob likes his ice cream.

[zekes]

when you can lift several other rockets with your rocket.

[vitekc45c]

When you have infinite delta v, with no mods.

kraken drives FTW

[Lhathron the Elf]

When your launch pad breaks on loading.

...and then you end up making it to the Mun and back twice with a single craft.

Edited November 7, 2014 by Lhathron the Elf