In it's latest bout of moronic idiocy the TSA has banned Tactical pens. Why? Who knows, maybe they're channeling Josh Sugarmann with some kind of tactical = scary = dangerous line of reasoning.
Any object in the hands of someone intent to harm you is going to be dangerous. I still have the mark on my left palm from when I was stabbbed with a #2 pencil to prove it.
H/T to Sayuncle