Is Gintama episode 14 filler?
Canon No, episode 14 of Gintama is canon.
#14
Boys Have A Weird Ritual That Makes Them Think They Turn Into Men When They Touch A Frog You Only Gotta Wash Under Your Armpits - Just The Armpits
男にはカエルに触れて一人前みたいな訳のわからないルールがある 脇だけ洗っときゃいいんだよ脇だけ
Aired 4 Jul 2006