Here's a fun little time waster that I'm sure most of you have seen before in some form or another. The object of the game is to move the red block around without getting hit by the blue blocks or touching the black walls. My best time so far is 34.7 seconds.
Reportedly, the US Air Force uses this to test fighter pilots in training. They are expected to go for at least 2 minutes. Give it a try! Post your best score in the comments.