Really? no one has seen "Detroit metal city"? it has no robots, but it has those guitar-slams to the faces, and It is a weird parody and comedy anime.
It goes like this: (no sexy stuff, but a lot of big words and some obscene content regarding the words
, be aware mentally young ones )
A young guy that is in love with an old classmate and likes french pop music (><)(no offense), but he actually is the lead guitar and vocal of a famous satanic band of Japan ( figure how weird can be the anime only knowing that fact )
So only the band and managers etc, know who he is (when in stage, wears a costume so his family and friends don't have a clue, and that's where the weird fun starts)
Oh, and he has the nice warm soft side, but when someone pisses him off, he goes berserk ^^.
Aside from that, 12 minutes episodes, with excellent art design, check it out at youtube or so, you wont regret it.