Since everyone is going on about eclipses today, here's one of the funniest things I've seen on YouTube recently (link sent by Aishwarya): the "literal video version" of Bonnie Tyler's "Total Eclipse of the Heart", which retains the original music but substitutes the lyrics with descriptions of what's going on in the music video (and a gloriously cheesy 1980s music video it is too). I love the "Fonzie's been cloned!" bit. And "Now I need a mop." And "Douchebags!" And many other things. Keep the volume turned up all the way.
Others in the literal-video series: REM's "Losing My Religion" ("Is that Dennis Rodman?") and A-Ha's "Take on Me".