What's the silliest mistake you've made in the Level Editor?

[Kman]

A while ago I built pretty much an entire city scape out of planes, only after about 5 hours of work I realized that I had made it 4 times larger than it was supposed to be. Yeah that was pretty dumb...

What about that Kman's Challenge? Was it like a year ago when you made that hardest map in the universe and put Cry to play it?

Lol, that was originally supposed to actually be a serious map but it ended up being so insanely hard that now it's kind of just notorious for how crazy it is X)