Five years after it launched, Chatroulette is still the place to go if you want to see a bunch of random dudes PLEASURING THEMSELVES. Which is why THIS is great.
Some guy on Chatroulette pranked random people by making it LOOK like that's what he was doing. He sat in front of his computer with no shirt on, and did a stroking motion. But you couldn't see WHAT he was stroking.
Then after a second or two, he revealed he was actually just drying a PLATE. Or he'd mix it up, and be polishing a shoe. And he also had a shirtless buddy help him out a few times, so it looked like they were pleasuring each other.