Hey, those are great!
I wonder why M$ hasn't incorporated them into windoze error messages? It would at least be something to look forward to every day when your OS crashes.
Programmers have fun with this stuff sometimes/ I recall a public health database prog I used to use that would only accept M or F for a sex field input. If you put Y, it would come up with a message that said: "Ha, ha, very funny! Now do it correctly and type M or F" or something to that effect. I discovered it when accidentally inputting a Y in the wrong field.
Cheers
Mick