u can find knock offs of infomercials wich means if yuo dont know, they put there own voice over a commercial to make it sound funny. Sometimes they fail at it and it sound dumb. look up "Billy Mayes Dub" or "Slap Chop Dub" on youtube
That's hilarious. This is a hard question, but I love BriTANick (pronounced like Titanic). They are having problems with their youtube account, but try BriTANick.com. I don't think this is my favorite, so I'll post a few:
College humor is always good. Jake and Amir are awesome
http://www.youtube.com/user/m5boarddotcom
All the vids from m5board, specifically the drag races. Fun to see what cars are fast, what cars are suppose to be fast, and what cars are mind-blowingly fast.
Can't post mine because the guy makes some stupid racial comments but it's a guy who picks up some illegals from the Home Depot for a job and ends up dropping them off at an INS office.