Dave has just had his left arm amputated after an accident at work. He goes to his local for a few pints with his mate Rick to drown his sorrows.
After half an hour a man with no arms at all comes into the pub bouncing around like he's on a pogo stick.
Rick says to Dave, "Look, you miserable twat. That guy there has got no arms at all and he's as happy as a pig in shit. At least you still have an arm."
Rick goes over to this guy.
"My mate has lost one arm and look at him, the miserable bastard. And here you are with no arms at all, but you're as happy as a pig in shit."