Here's a funny video of an automated weathercam which was displayed on live Czech TV that was hacked to display a mushroom cloud. The footage looks pretty realistic with the camera whiting out for good period before showing the cloud. There wasn't any shockwave though which kind of gave it away as being a prank. War of the Worlds is that you?
Here is a funny Nissan commercial from Canada where the salesman keeps changing the name of the car and his own sterotype to be most like the customer.
This video features Godzilla playing the first level of Super Mario Brothers. I'm going with Godzilla is overkill in this setting. What have the mushroom guys got against his lightning breath attack? Apparently the mashup was done with a side scroller EMU application.
This video has some excerpts from a show where a guy performs a short version of Star Wars and he plays all the characters. It's called the One Man Star Wars show.
In this commercial a guy comes out of his house to find his car is snowed over. He spends a bunch of time scraping the snow and ice off his car. When he goes to unlock it he finds that it isn't his car he cleaned. Apparently he didn't have his morning coffee.
Here's a milk commercial where a guy sees an accident about to happen and attempts to stop it. He gets all worked up getting to a spot where he can avert the accident and then ends up not having a plan once he gets there.
This is the second version of a animation where the creator draws a stick figure in Flash and then battles the stick figure as he attempts to take over the drawing area. The original animation took something on the order of six months to create.
Here's a video of a bunch of oriental cats synchronized to music using a cat toy off camera. The cats follow the cat toy up and down with the music playing in the background.