A drunk is sitting at a bar when a woman stands behind him and
raises her arm really high to get the bartender's attention.

She has very hairy armpits. The drunk sees this and yells at the
bartender, "Get the ballerina a drink."

She gets her drink and goes away.

Later she returns and raises her arm again. The drunk sees her
and yells to the bartender, "Get the ballerina another drink."
She gets her drink and goes away again.

The bartender asks the drunk how he knows that she is a ballerina
given that she is a stranger and has never been in the bar before.

The drunk replies, "She's got to be a ballerina if she can lift
her leg that high."