[MicroBob]

I think it probably is closer to the saying-hijack-in-airport thing as someone mentioned.

If somebody was bombarding the chat with, "I'm a bot. I have a special program and can all your hole-cards. I'm a bot I'm a bot I'm a bot Ha Ha Ha" I think it could have a deterimental impact on the game.
No matter how stupid and obvious the joke is there can always be a player or three who believes him.

The idea of sharing each others' cards via AIM and then bragging about it to others at the table isn't completely impossible either and almost certainly could scare someone.

I stopped playing at the same table with a guy I know because people were noticing we were from the same town and would become suspicious and/or leave the game.