How to piss off Zetsu

Put fertilizer in his sandwich and see if he eats it

If he does, tell while he's chewing

Laugh your head off when he gags on it

Tell Tobi that Zetsu wants to talk with him

Before that write all over his fly trap and tell him Tobi did it

Watch as Zetsu kicks his ass

Tell him he wants to talk to his other personality

When he does repeat process over for an hour(Screw it, all day)

Sing "I'm Walking on Sunshine" over and over till it gets stuck in his head

And, Tell him that flys are extinct