What did people do in Arcades that just irritated you to no end?

I remember when Super Mario Brothers came to our arcade coupled with Duck Hunt. It wasn't hard at all to make games last a long time on it which was maddening when you were waiting to play it. However, there was always some idiot who would spend forever looping in 5-2 (I think) through the 1-up and get the coins and then kill himself. The end result was that he had to do it 5 times to get an extra free guy. Some people would spend hours just doing the same looping level and it was incredibly boring.

The worst part was that these were the guys who didn't need all those free guys to begin with.

Any of you folks have similar memories?

D