Attack on Titan X One Punch Man << wtf there're more in there than just those <<< Fairy tail, Gintama, Fullmetal Alchemist, Assassination Classroom, and Food wars are also there but I don't know the others
A basic rule in anime...the one who smiles the most is the last person you want to piss off...because when their smiles fade away...and you are the reason why...whether you hurt their nakama...or insult what they stand for...they instantly turn into your worst nightmare, funny, text, Anime characters, crossover, Maes Hughes, Fullmetal Alchemist, Mirajane, Natsu, Fairy Tail, Shanks, Luffy, One Piece, Gintoki, Gintama, Goku, Dragonball Z, Asakura Yoh, Shaman King; Anime
Gintoki Strikes!! Shogun K.O.!! (Note: touching even a single hair on the shogun's head is punishable by death, as he is the most powerful man in Gintama's Japan- long story short, Gintoki f***ed up reeeeeeal bad).