I found this story on livejournal... Just when we thought we'd seen every kind of computer error known to man, we discover one that really takes the cake (geddit??)
Wegmans is a chain of grocery stores originating out of Rochester, NY. It seems that you can email cake orders to the company and include a message for the recipient as part of the email. The email is parsed by a computer in the bakery and the message is printed on the cake using some kind of food-grade inkjet printer.
The message sent to the bakery was a mixture of English and Italian, and apparently included some HTML tags that the automatic printer didn't like.
Enjoy!