It's a bad idea to outsmart yourself with clever alert messages:

Sysadmin pilot fish gets a wireless-enabled handheld computer with lots of cool features. "I find out how to use a voice recording as the alert tone when I'm paged, and record a message that says, 'Wake up, @#$%!' when I'm paged by the servers," fish reports. "And promptly forget about it. Until I'm in a meeting. And get paged." Red-faced fish can only mumble, "My server is paging me" -- and beat a hasty retreat.

Reminds me of an error message a consultant I worked with once inserted into a general ledger app. He was working late, very frustrated, and had an "account not balanced" error pop a dialog that read "Balance this, a******". That went over well in acceptance testing :)