My Favorite Error Message

Many years ago (almost 20 years!) I was documenting software and creating training for a large medical information project at Bell Labs. I came across an error message for a field that I got a big kick out of. It said:

Please Disambiguate This Field.

I could never be certain that the programmer was joking. Knowing that crowd of button-down programmers, they were probably serious.

What made me think of that today?

Wikipedia:Disambiguation