At the cinema a man noticed a young woman sitting all by herself. He was excited to see she had both hands under her skirt and was playing with herself furiously.
He moved to the next seat to her and offered his help. She welcomed his help, and so the man started playing her like crazy.
When he tired and withdrew his hand, he was surprised to see her go back to work on herself with both hands. "Wasn't I good enough?" he asked sheepishly.
"Great," she said, "but these crabs are still itching!"