We had just moved into a new school district when my brother was invited to a surprise birthday party. He didn't want to go because he couldn't recall ever meeting the birthday boy.
"Ridiculous!" said my mother. "If he didn't know you, his mother wouldn't have invited you." And with that, she sent him off to have a good time.
When Dave came home, Mom wanted to know how it had gone.
"Well," he said glumly, "We got there and everyone hid behind a couch. Then, when the boy came in, we all jumped up and yelled, 'SURPRISE!' And he pointed straight at me and shouted, 'Who is he?'"