Slice
Play 'Pizza City' Video Game Online
One of the most amazing time-suckers I’ve seen in awhile: The 8-bit Pizza City game on the Adult Swim website.
Pick up a few pizzas from Uncle Tony’s, hop in your boxy little car (like the rest of the game, looking pretty 1987), and drive around Pizza City looking for your impatient customers. Fast deliveries get better tips; smashing into pedestrians gets you dinged for "damaging the pizza." (But for some reason, running down clowns and mimes is OK.) Just watch out for other cars—Pizza City apparently has some issues with reckless drivers.
Feel free to leave your top score in the comments.