"Tall Tales" --
Izzie Stevens:
Hottest dead guy reappearance:
That Rembrandt kissing ad:
Battle of the Jacks:
I have to say, "Tall Tales" would have been a whole lot funnier if I'd never seen X-Files' "Bad Blood." Or "Jose Chung's From Outer Space." Still, you have to love:

Dean with a mouthful of candy

Slow-dancing aliens

Bobby giving the boys the hairy eyeball