Sunburn

He fell asleep and after a whole day his legs were sunburnt beyond belief and he could hardly stand for the pain.

So he goes along to the doctor for treatment.

The doctor looks at the man's sunburnt legs and says, "well, you realize that this is only a small village doctor's surgery and, in reality, I've really got nothing at all to help you." 

He then gives the man one tablet of Viagra: "However, try this", he adds.

So the man says "but I've got acute sunburn what's a Viagra tablet going to do?"

The doctor says, "basically, nothing at all for the sunburn but it will help keep the sheets off of your legs tonight."