One time in 8th grade, I was punished from watching TV the entire school year.
How could they monitor it? Well my dad used to work the overnight/second shift. While we were at school he would unhook the cable boxes (the old Jerrold boxes at the time) and all that before I got home from school.
One other time I got a car, (a 1978 Mustang). My birthday was in November, and I couldn't drive it until my license (obvious rule.. makes sense). See, since I lived in a rural area, there were no local cops, many kids drove around without licenses!
I went to a U2 concert in September and got in huge trouble. I got home like 2 in the morning, and well, I "fudged" some details about the concert .
I was grounded until my birthday. Being in a very rural area, you couldn't do anything.. nothing was going on, and it was very frustrating.