Anime mix up/parody videos

I've found quite a few funny or awesome mix up or parody videos which combine the musical themes or art style of 2 animes and mix them together, for example this one which i just found and i think is awesome, which is the Nichijou opening with characters from the Madoka universe
[video=youtube_share;hZxUinHVUbU]http://youtu.be/hZxUinHVUbU[/video]
(I love how it even has the characters from the manga :3)

or the Durarara! opening with characters from Steins;Gate:
[video=youtube_share;NIBEQIcU0Lg]http://youtu.be/NIBEQIcU0Lg[/video]

There's even ones that mixes anime with things that aren't, such as the Durarara! ending theme with Harry Potter characters, or the the Higurashi Kai opening theme with Final Fantasy 7 characters.

Anyone else got any to share? i love these things

[video=youtube;zi2NXUQ16wc]http://www.youtube.com/watch?v=zi2NXUQ16wc[/video]
Nitro+ parodies Madoka's opening with their music mascot, Sonico. Enjoy the other nice Nitro+ cameos if you can spot and identify them when they all show up. Nitro+ took down their video, so this Spanish subbed version is all that's left. Enjoy.

[video=youtube;RwVJ1_Un6qU]http://www.youtube.com/watch?v=RwVJ1_Un6qU[/video]
This SZS-Ace Attorney parody is popular and pretty well enjoyed.