Back in the day, Geocities had some company that pays per ad clicks. It was a primitive program that had an ad for expedia.com. They paid $0.10 per click through.

I set up a program that moves the mouse and it would click on the ad and hit the back button.... over and over again. I ended up getting a $308 check 2 months later. They long discontinued this... but I had fun. I had all advantage.. i got about $30 from them... but got bored with them.