Extremely Real Realistic Realized Realism Overhaul
Mails a couple of full-sized rockets to your doorstep. Time to find out how to fit a Saturn V through your door.
For me, I used http://ksp.olex.biz/ when trying to figure out transfer windows, but once you send enough things there, it starts to come to you from memory.
The rules are simple: list as many dumb ways, no matter how big or small, your KSP missions have failed
I'll start it off...
Confusing retrograde with prograde. You can probably guess what happened next...