I knew people were shy but bladders? Apparently they are (via Hot Air):

Given the choice, you probably prefer your home porcelain throne to using a public toilet. But for more than 20 million people in North America, peeing in a public restroom is no simple matter.

People with a "shy bladder," a real condition also known as paruresis, are fearful of urinating when other people are nearby.

At least there seems to be some help available:

Eighty to 90 percent of sufferers can get considerably better through cognitive-behavioral therapy, which gradually exposes people to their feared situation in small steps, says Soifer, author of "The Shy Bladder Syndrome."