My sister invited a few friends over and they were playing Truth or Dare.

I listened from around the corner, being the nosy brother that I am. It was my sister's turn and she chose "Truth". I listened on intently.

One of her friends giggled and said, "When was the last time you had an orgasm?"

My sister thought for a few seconds and said, "It was a week ago."

Then I burst into the room and shouted, "I knew you faked it last night!"