re: Longest you were grounded as a youth and why?

One month. My parents figured out that grounding me from video games and whatnot was much more effective at getting me to behave than a spanking.

I was probably 6ish and my mom picked me up at my grandma's one summer day after work. She was inside talking while I sat in the truck. It was hot, so I turned the ignition to try to get the AC going. Problem was, it was a manual so it jumped forward and rolled about 10 feet into a pine tree.

Dad was pissed when he got home.