In the N64 version of Mario 64, the 1-up mushroom would slowly chase you no matter what. Japanese gamers have created a fun new mini-game out of this "event", with hilarious results. The video is especially funny when he thinks he's "safe", and the 1-Up is actually creeping up on him.
Any fan of Mario should check this out.
If you just want the funny part (the payoff), skip to 5:30