I love Kerbal Space Program.
I sucked at Kerbal Space Program for a while.
So, I made my first attempt at Mun. It was the three seated capsule, with only one launch stage and a landing stage. I landed safely only to realize I spent all my fuel. The obvious course of action was to send another, bigger, ship to rescue them. I then built a bigger ship... But it was only a bigger ship, as I had added another stage, but forgotten extra space for the kerbals I was trying to rescue. Finally, I sent a third, monstrous rocket with 6 empty spaces only to find it only had enough fuel to make the return trip from orbit. I used the second ship to drop the first 3 off, landed, and took the remaining three up. I then sent it back to Kerbin, decoupled all three capsules in atmosphere, one capsule tore off the parachutes of another, so 3 of the kerbals died.
Fun game, I recommend it to anyone who likes that kind of stuff.