Guy walked into a little corner store with a shotgun and
demanded all the cash from the cash drawer. After the cashier
put the cash in a bag, the robber saw a bottle of scotch that he
wanted behind the counter on the shelf. He told the cashier to
put it in the bag as well, but he refused and said, "Because I
don't believe you are over 21."
The robber said he was, but the clerk still refused to give it
to him because he didn't believe him. At this point the robber
took his driver's license out of his wallet and gave it to the
clerk. The clerk looked it over, and agreed that the man was in
fact over 21 and he put the scotch in the bag. The robber then
ran from the store with his loot. The cashier promptly called
the police and gave the name and address of the robber that he
got off the license.
They arrested the robber two hours later.