He'll arrest you.
Ziva is a girl, not a guy. I think she'd do a lot worse than arrest you. She's an Israeli Mossad agent who knows 18 different ways to kill you with a paperclip.

Her philosophy is, "If it annoys you, kill it."
As for Scruffy, don't piss him off or he'll let your boiler explode while he reads porn magazines!
Never piss off a Big Daddy from Bioshock.