Very Big IT company that shall remain nameless ('cos I work for it
). Very Big customer, looking to spend Very Big money on a Very Big computer. Demonstration in full swing, when Very Big computer locks up with the message "You lose big time, sucker!"... d'oh
explaining that one was fun
(although I must admit that i've had a service call when code I wrote threw an Exception saying "you should never see this Exception" - it seems there really are JREs that don't support ASCII...
)
edit: and there's the classic UNIX "Printer port on fire" error message