"War Veterans" joke

Santa mistakenly gets on a bus full of war veterans, but upon discovering it is going his way, decides to stay on for the ride.
He sits down next to a guy that jerks his head to the left every few seconds, over and over.
This really bothers Santa so he asks him, "What's wrong with you?"
The reply is, "I got this in the war."
Santa finds this pretty disturbing so he switches seats.
The next guy he sits by has uncontrollable spastic twitches in his right leg, causing him to kick the seat in front of him, and even kicks Fred a few times.
So Santa asks him, "What is wrong with you?"
Again the answer is, "I got this in the war."
Santa moves. The next guy poor Santa sits by begins erratically flailing his left hand.
Santa says, "Let me guess, you got that in the war?"
His reply was, "No, I got it out of my nose. I can't get it off of my hand."