A young woman was a prostitute and, for obvious reasons, didn't want her grandmother to know. One day, the police raided a brothel and arrested a group of prostitutes, including the young woman.
The police had the all the prostitutes line up in a straight line on the sidewalk, just as grandma was passing by. As soon as she noticed her granddaughter, she stopped and asked her what she was lining up for.
Not wanting her grandmother to know the truth, the granddaughter told grandma that someone was passing out free oranges and she was lining up for some.
"That sounds good. I think I'll have some too," Grandma said, as she made her way to the back of the line.
A policeman went down the line, questioning all the prostitutes, until he reached grandma. Looking very bewildered, he said to her, "You're so old, how do you do it?"
"It's easy," replied Grandma. "I just remove my dentures and suck them dry!"