It's a funny head explosion, but as far as head explosions go, you need to see a movie called Maniac. Dude gets his head blown all over the back of a car with a shotgun. It's freaking sweet! ^___^
Here's a video (warning: this head doesn't explode into Hello Kitty stickers)
And yeah, that's Tom Savini as the dude in the car AND the dude who jumps on the hood. I think when he shoots the girl it's back to the other actor though.