Dumbest thing you've ever did?

In reality, what is the dumbest thing you ever did?

For me, it'll be the time where I had a very bad habit of trying to ram down doors when it's locked and one day I did the same thing only that a teacher opened the door and I rammed into her. That happened in primary school I think O.o.
I never charged at a locked door ever again .

i play maplestory.

I entered teh internetz