Damn i was gonna say Guitar Hero. Oh well. Heres a trick to try while playing Guitar Hero and especially while stoned. Play through a couple of songs and then look at something stationary right after u win the last song. Shit will look like its moving or waving around for a few seconds. Its an optical illusion caused by staring at moving images for so long and it takes your brain a few seconds to compensate and look at still images. Its really trippy and funny as fuck while your stoned, but its pretty cool when you're not too.