a few weeks ago i was outside smoking a joint and my friend came over and wanted to smoke too. so we decided to roll up another joint and go driving around hot boxing it. close to the end of it i was getting really pretty stoned and then i took a hit and all my vision just blacked out. i could still think (barely) but i couldnt see a thing. my vision was gone for about 5 seconds or so. thank god no other cars were around cause i would have surely hit somebody. other than that it was a great time .