A policeman catches a man with some weed in his pocket.
"You're going to jail for all that marijuana in your pocket!" the policeman stated.
"But officer, this weed isn't mine. It keeps appearing in my pocket every time I flush it down the toilet" the man replied.
"Oh, really? This I gotta see. If you can prove it, you're free to go!" the policeman challenged.
The man takes all the marijuana out of his pocket and puts it in the toilet. He then pulls the handle and watches it go down the drain. Several minutes go by and nothing happens.
"Why hasn't the weed appeared back in your pocket?" the policeman asked.