Pity Jason Striegel. He got his AIM (AOL Instant Messenger) account added to a list of sex chat bots...and can't convince IM'ers that he's really human. Read "How I Failed the Turing Test".
The Turing Test, for those not familiar with it, is a test of artificial intelligence proposed by Alan Turing, in which a computer program tries to act like a human in conversation. Turing envisioned using teletypes to hide the machine, but the 'net does the job even better.