I’ve had them confiscate a P38 can opener from inside my wallet.
If someone can successfully hijack and airliner using a P38 can opener, every single person aboard that aircraft deserves their fate.
FWIW the 9/11 hijackers used box cutters and other small knives to take control of those planes. I have no doubt similar items could get through today.
Last year I took a SOG Slimjim XL with a 4" blade on a trip. It made through security 3 times and got taken on the 4th and final trip through TSA. TSA's job is to make people feel like the government is doing something...