Cleaning out my purse just now prior to getting on a plane tomorrow morning. Got to the bottom and found a large black plastic rubber knife! Yikes. Pretty sure the TSA folks wouldn't be too happy about me trying to bring that on a plane.
I borrowed it from the taekwondo dojo before my black belt test to practice with, since one of the self-defenses I created for the test would be used against a knife attack. Perfectly legitimate reason for me to have it (although I really do need to remember to return it) but not so much a reason for me to carry it on a plane. Glad I found that before the TSA did!!