What is the stupidest thing you have ever done? (Other than answer this question)

I'd tell you but by time you read this I will have outdone it.

"I don't remember, but my ex-wife has a long list!!"

Let a person who rear ended me go without incident because I thought there was no damage done to my car. She seemed so nice and sorry for hitting me, i felt sorry for her. Turns out, later that day, my neck hurt really bad, and I had to pay for the doctor bill myself. I felt like an idiot.

I'll have to get back to you. Gonna take some time to compile a list, narrow down the choices and pick just one.  

I got married and the other thing was not leaving when I saw the true nature of the situation. Don't ask.