Sexy Commando Gaiden: Sugoiyo
The name of the anime series starring a boy who meets a guy named Masarusan, who has a fighting style called, "The Sexy Commando".
To do the Sexy Commando, Masarusan unzips his pants (That's right kiddies) to distract the opponent. Then, he goes at them, violently attacking them with his fist. Sometimes he likes to gross his opponent out by having pigeons fly out of his pants.