Ah, that a good topic for the time being.
I LOVED most Weezer videos, those guys are genius at the art of the Music video. In fact I even own the "Weezer music video collection" DVD. Some of my favorites included...
Buddy Holly (features the footage of "Happy Days.")
Island In the Sun-This one actually has two different music videos but I'm maily talking about the one with all those animals. You would have to have a "heart of stone" to not smile seeing all those animals and Weezer together.
Keep Fishin'- This is OF COURSE an easy one to like as it also features our beloved Muppets. One of the BEST music videos EVER!
(at least in my mind). Again you would have to have a "heart of stone" or something to not get a kick out of this video. I've honestly seen this video maybe close to 100 times, as I own it on not one but two DVDs (Weezer music videos and the Muppet Show season 2 set) as well as bought it off Itunes to put on my Ipod.
Other ones I've enjoyed included...
Michael Jackson's Thriller- A classic to the "music video era."
Guns and Roses' November Rain- A bit overblown in some poeople's opinion, but I thought it was awesome.
Beatise Boys' Sabatoge- Those guys are characters, that's for sure.
As for "worst and/of funniest" (though I think in these cases they weren't meant to be funny) pretty much any "Hall and Oates" music videos were awful. Those were two stars from the 80s that WASN'T prepared for music videos and MTV to get so big and became a mainstay for music artists.