"That wife of mine is a liar," said the angry husband to a
sympathetic pal seated next to him in a bar.
"How do you know?" the friend asked.
"She didn't come home last night, and when I asked her where
she'd been she said she'd spent the night with her sister Shirley."
"So?"
"So, she's a liar. I spent the night with her sister Shirley."