The dumbest thing I have ever done? God its so hard to choose.
lets see, well, this one time I got drunk at my friends house, but I had left my cigarettes at my house, and suddenly struck up the Idea that it would be ingeniuos to walk the 15 miles to my house to get them...so i did. My brother and I made the treck in 4 hours, minus about 45minutes in an Ihop drinking coffee.
Another time my friend and I had to run from the police, while drunk, because as we were walking home from a party, 2 miles not 15, he had to stop to pee. So he did so on the nearest building. At the time we weren't aware that the building was a church. Needless to say when the cop who was parked across the street in an unmarked car watched my friend pee on this church, he was less than satisfied. He got out and without yelling, saying freeze or anything, started to run over to us with his flashlight out. My friend, mid-stream mind you, turns and starts running away, pants at his ankles screaming "I just had to pee officer!" as he runs away, privates flapping in the wind. We knew the neighborhood well, so we got away.
Ahh good times