TSR
Way back in the days of MS-DOS, I had a good friend in the office who was of Mexican descent.
I wrote a little TSR (Terminate and Stay Resident) program which I installed in her autoexec.bat - it hooked the keyboard interrupt and monitored the keys being pressed. Whenever she typed her name at the end of a document, the computer would cheerily play the 'Mexican Hat Dance' song through the PC speaker :-)
Eventually she discovered that pressing backspace part way through typing her name would avoid triggering the tune.
Ah, happy days!
[Beer because there's no tequila icon]