[naet]

I think you don't need to definitely prove you're human or pass some kind of adhoc turing test. You just need to convince them that whatever need they have can be taken care of via the chat widget.

If the need is to speak to a human, help them schedule a phone call with a sales rep / support rep / relevant party.

[gnicholas]

Oh, these people never have anything they want to accomplish, other than to waste the time of a person (or cycles of a computer)!