I thought this was pretty funny. Anyone who's seen the video for Aerosmith's "Love in an elevator will know what I'm talking about".
Create a user account on your system with login 'tyler' . Log into that shell, and issue the reboot or halt command.
You should then get this message... "Oh, hello Mr. Tyler... going DOWN?"
The message is a reference to the "Love in an elevator" video, where a sexy chick asks Steven Tyler this question at the beginning.