At Blockbuster the other day I was serving a customer who forgot to bring their membership card. Since they also didn't bring any identification I couldn't let them rent and was explaining this to their angry face when I noticed their partner had a Blockbuster membership card in their hand.
So I said, "Oh, you could use that so long as you're named on the account."
She looked at me, startled, then handed the card over to me.
"OK, are you named on the account at all?"
"Yeah, but it's my Grandma's account"
"OK, but has she named you on the account to rent?"
"What's your name?"
"I... don't... know"
It reminded me of the Simpsons clip where Homer pretends he's Mr Burns and forgets his first name:http://youtube.com/watch?v=3kqAWWNZqjM