You practice techniques on clothes manichans at the store
You bow in and out of every building you enter
You use a katana to cut vegetabled, meat, bread, etc.
While sweeping your house, you end up practicing bo kata with the broom.
you dont walk in your sleep, you practice kata.
Whenever you shake someones hand, you can't resist putting them in a wrist lock or an arm bar
You close doors with side kicks.
you speak in Zen like riddles when carrying on a casual conversation.
You think you are a reincarnation of Atila the Hun, Bruce Lee, Gichen Funakoshi, Motobu Choki, Morihei Uyeshiba, or Gusukuma Shinpan.

You know when you're obsessed when you get kicked out of the public library becayse you practicing for 2 hours..... (the mean old hag......)