Kind of tempted to do it again...
Wrote a bot that generated a name and joined a big public channel.
Stuff like jenny21 tina123 etc.
Then it spammed some generic greetings and waited.
"Hello, anyone wanna private chat?"
When someone started to talk to it it would start another private chat with another person choosen randomly and copy the messages of the first person to the second and vice versa.
Then it copied the whole conversation in a different channel.
Hilarity ensued.
Sidenote to newcomers: burn them dvds periodically! (oh, no, ultrabooks...)
We always thought we'd just get told to bugger off. Rarely was that the case.
By some odd coincidence, I've since moved to the other side of the world but I sit and type this message in the old living room in Sunderland where many of those calls were made.
1. Disclosure: I am one of the author
The website has been copied practically wholesale.