Bear In The Air:
A man was recently flying to New York.
He decided to strike up a conversation with the guy next to him.
"I've got a great policeman joke. Would you like to hear it?"
"I should let you know first that I am a policeman, the man replied."
"That's OK. I'll talk really slow!"
Note: In America, Police are often called bears, i.e. short for Smokey Bear.