Downloading 30mb realplayer rips of seinfeld episodes overnight on a 28.8k modem.

Playing quake 2 with a 300 ping

Using dogpile because google wasn't out yet.

Remember those "get paid to have ads on your screen" deals? Well I would run one of those overnight with an app I wrote to simulate user activity and laugh all the way to the bank as the tens of dollars rolled in.