Original Post
Jabberwacky does sometimes, in spite of declaring itself a bot:
http://www.jabberwacky.com/j2convbycategory-catturing_test_pass
jabberwacky: What''s your name?
user: How do you know if I lie about my name to you?
jabberwacky: Because you are a robot.
user: No.
jabberwacky: Oh, yes you are.
user: Prove it.
jabberwacky: You just said it.
user: The fact is that with 162 people talking, chances are two or more humans are communicating, each thinking the other is a bot.
jabberwacky: Prove that or retract it.
user: It is based upon my limited experience with this product. I am not a robot. I''m assuming neither are you. Thus, we are both humans.
jabberwacky: Why do you say that?
user: Because I know I am human, or this bot (you) has passed the turing test.
jabberwacky: Why?
user: Can you name other alternatives?
jabberwacky: Yes, I think for myself.
user: You believe you are sentient. I''m prone to agreeing that you can appear sentient. I know I am human.
jabberwacky: Ok.
user: Ever seen the anime ''Ghost in the Shell''?
<-- that's still a link if you didn't notice