Watch this. Watch it and tell me that it doesn't look like fun — that you don't want anything more than to ride aboard a ping-pong-ball-filled 727 (aka a "vomit comet") while it flies along a parabolic flight path (thereby simulating weightlessness) with thirty other people. That's right. You can't.
Further proof that the best science experiments often involve borderline-ludicrous quantities of ping pong balls.