That wife of mine is a liar,” said the angry husband to a sympathetic pal seated next to him in the bar.
“How do you know?” the friend asked.
“She wasn’t at home last night, and when I asked her where she had been, she said she’d spent the night with her sister, Shirley.”
“So?” the friend replied.
“So, she’s a liar because I spent the night with her sister, Shirley!”