A guy falls asleep on the beach for several hours and gets a horrible
sunburn. He goes to the hospital and is promptly admitted after being
diagnosed with second degree burns. With his skin already starting to
blister and seeing the severe pain he is in, the doctor goes ahead and
prescribes continuous intravenous feeding with saline, electrolytes, a
sedative, and a Viagra pill every four hours.

The nurse, who is rather astounded, asks, "What good will Viagra do him,
Doctor?

"It'll keep the sheets off his legs."