* Doctor Who - World War Jump
When the film Love Actually came out, Girls Aloud did a cover version of "Jump". I preferred the original version of the song (by the Pointer Sisters), but the new video was quite well done, since it had the group sneaking around 10 Downing Street intercut with scenes from the film. A couple of years later, there was a Doctor Who two-parter ("Aliens of London"/"World War III"), which also took place in 10 Downing Street, so this video mixes them together. It's very well done, so you see Girls Aloud peering around a doorway while the Slitheen go charging past in the background.
* Saturday Morning Watchmen
This is impressive, partly because of the effort involved: he's actually done all the animation himself, rather than just dubbing over old "Superfriends" episodes. If you've read "Watchmen", this is very funny; if you haven't, you probably won't appreciate it. (I haven't seen the film yet, so I don't know how much that will help.) At first glance, it just seems like Watchmen Babies, i.e. parodying a spin-off that misses the point of the original. However, it also works as "fiction once removed", since Adrian Veidt authorised this cartoon in the comic.