I often wondered why simple CAPTCHA's like "Type the number seven
four three", or "What is the sum of two plus three?", or "Spell cat",
or "Spell two" wouldn't work? Certainly, one can create a routine
coupled a dB to randomly produce thousands of different combinations
of simple questions. Likewise, a sound file could be produced the
same way.
This could get hard for people, not everybody does understand a lot of
English. So if you're asking a question, it does also get harder for
some humans and that's not what we are looking for.
Tijnema