I used to work with a guy who was....weird.
So anyway...
He bought some things for his car stereo and couldn't get them open.
He finally got mad and dissapeared out into his car and came back with a knife. A fixed blade, about 3.5 inch blade.
Back in he comes and he used it to get his stuff out.
Then he dissapeared again and left his knife laying on the table.
We didn't care. For the most part I worked with cool outdoorsy guys.
About ten minutes later he sees his knife and says:
"OH CRAP!" He RAN over to it and stuffed the entire thing, sheath and all in his pocket and looked at us with the guiltiest look I've ever seen.
We said:
"What's your problem? Were not scared of knives you know"
He looked at us like we were stupid, and held the blade across his palm. Making sure to hide it under the counter.
He thought because the blade was longer than the palm of his hand, it was as illegal as a machine gun or something.