"お前はもう死んでるぞ/ You're already dead!" -Kenshiro from Fist of the North Star as said to an opponent whom he has just struck with his time delayed head exploding technique (hokuto shinken).

both are from naruto
Sasuke: If it happened so it happened.
Naruto: YO! Aloe Vera, where the Fuc* is sasuke!?

"Art is a bang!" (Deidara from Naruto), I like "I am God!" (Karin form Kimichama Karin) too...

"Itsygo!!!" :D - nell (bleach)

"Timotei"- Konata (Lucky Star)

hmm
 

I found a catterpillar. He'll get squashed...

Hotaru saying that to Akira (from Samurai deeper book, they are both from the four emperors)

Echt jetzt (Naruto german)

Falcon PUNCH! - Captain Falcon. I think that kind of says it all.

Rena's "USO DAAAA!!!"

おれを誰だと思ってる ー グレンラガン
Who Do You Think I Am? - Gurren Lagann