A long time ago, I found this at http://www.paranoia.com/drugs/.

A man was waiting for his mail delivery. He was expecting his weekly newsmagazine and a free sample of detergent. In the meantime, while he was waiting, he decided to build a snowman in front of the mailbox so he could have some fun watching the mail truck knock it down. But when the mail truck arrived, the mailman refused to drive over the snowman, and told the man he’d have to wait for his mail delivery until he took the snowman away.

“But what about my favorite newsmagazine and my free sample of detergent that are supposed to be in today’s mail?” the man asked.

“Sorry,” said the mailman. “Time and Tide wait for snowman.”