A doctor on his rounds in a mental hospital sees a couple of patients behaving rather strangely. The first man is sitting on the edge of his bed clutching an imaginary steering wheel and making loud noises not unlike a 18 wheel Mack truck.

"Vrroooom, vrrroooomm... Screeeech..... Vrrroooommm...."

"What are you doing?" enquires the doctor.

"I'm taking this road hog down to Barcelona," replies the ex-trucker.

Somewhat taken aback but not to be put off, the doctor moves on to the next bed where he can see some very energetic activity going on underneath the covers.
On pulling them back he finds a man totally naked face down into the mattress....humping and bumping.

"And what are you doing?" asks the doctor, a little perplexed.

"Well," pants the man, "While he's in Barcelona, I'm screwing his wife."