It talks, and replaces what it knows with things you have said. It can get hilarious. Please post your conversations in the comments. I'm always up for a laugh! ~~~~~~~~~~~~~~~ So, I was going to add a hidden feature where you can fight him, Undertale-style, but I couldn't understand all the coding, so I removed it. But part of it was permanently there, so I had to enlarge Chatty's head to cover it. So sorry.
Thanks @seanmcmanus for the funny copying parts.