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

[JenniferOrange]

I felt this deserved a thread. :] So, what is the stupidest/silliest mistake you've made while using the Level Editor?
I was just starting to learn the level editor, and thought it would be hilarious to scale a grunt and put him inside of the glass case. It was the worst idea of all time...
My older brother was sitting next to me, laughing, and telling me to make him super puny. When I loaded the map, I looked and noticed the glass case was empty. Naturally, I was curious to know where the grunt was, and walked out of the room and he was right in my face. I pretty much peed my pants.