It's time for the oldie but goodie:
In order for Santa to fly in US air space he needs to have an annual check ride with an FAA examiner.
The examiner meets Santa at his sleigh and proceeds to climb aboard when Santa notices something bulky under the examiners coat.
"What's that?" asks Santa
"Oh, it's a shotgun," says the examiner
"What for?"
"Well, I'm not supposed to tell you this up front, but we're going to experience an engine failure."