You see, you draw boxes, circles, lines and such and realistic physics immediately takes over. The goal is to touch the jewel with an object you've set in motion. Perhaps it sounds boring, but it is infecting. The game, Crayon Physics, is a bit like the Mousetrap game of old, but in 2D graphics. It only runs in Windows (XP/Vista), but a user reported success running it in Linux under Wine. Perhaps Parallels or Fusion will run it on a Mac. The link above has a video of the game in action. Here is an NPR report. There is also a trial version (starts immediate download).

Other weirdness: She stole his heart so he gave her his kidney. And now he wants it back.