My sister-in-law’s boyfriend went off to Amsterdam with a dirty* knife and fork in his bag. Got there fine, but security noticed it on the way back.
I got pulled aside by security once because they thought my car key was a flip knife. I’m fairly certain I wasn’t the first person to have passed through with a car key that folds out from the fob ffs.
(*Dirty as in he’d used it for his dinner at work the day before, rather than there being naughty pictures on the handles)