Stupidest thing you've ever done...
I'll start..............
I had just moved out to SF in '98 and still had all of my car info (insurance, plates, etc) in my old state. Well about 5 months pass and I decide to let every (including the insurance) 'laps' since I figured I'd sign up with a local place when I finally hit DMV to update all of my shit. Not 3 days later, I slam into a truck (my fault) and total him. A long story short, I was out $10K to fix his truck (buy him a new one) and had no wheels. Lucky for me the guy was cool that I hit and no one was hurt but it was a lesson well learned. Pretty lame but stupid