As a soldier approaches a checkpoint in the dark the voice of the sentry suddenly barks, "Halt! Who's there?"  

"I'm an American," came the reply.  

"Is that so? Okay, advance and recite the second verse of the 'Star Spangled Banner.'"  

"It's, uuuuh, something-something, the morning's first gleam, tell you the truth I don't really know it," came the confession finally.  

"Proceed," said the sentry.