Not my own, but I will tell from the first person, funny, in my opinion.

I am standing in the parking lot, screwing something under the hood there... The man goes:
Do you have a knife? I need there...
I decided to shake:
No, there is no knife, there is a gun.
The man raises half a jacket - there in an operational cobra - well... a gun. The man says, I have a gun, I need a knife.