Irssi

Fast, modular, Perl-scriptable, and low memory imprint IRC client. The official client of Buttes, Bantown, and Insub.

To scroll in irssi, simply hit escape, then p to go up or n to go down. Remember to hit escape for each window move. It couldn't possibly be easier! As an alternative, if you happen to live in the current era, you can just use the "Page Up" and "Page Down" keys, though irssi loses half of its fun if you do that, and of course that only works if you're actually using a terminal, and not a VT100 compliant xterm, in which case you're just scrolling your xterm.

As a drama-generating technique

EPIC and BitchX fanatics are known to get penis rash when confronted with the facts of irssi's excellent UI and superior scriptability. It is suggested that you join #epic and #bitchx and scroll "irssi 4 lyf" in rainbow figlet.

Alternatively, irssi users can be butthurt should you suggest they use an IRC client that lets you use the magical technological advance known as a "Graphic Interface" instead of using a 30-year-old Command line.

IRC: Serious business

As the irssi faq notifies us:

Q: How do I autorejoin channels after being kicked?
- A: That's evil and you shouldn't do it... If you're joined to channels who kick people for fun, try changing channels or something.

In this way, the creators of irssi remind us that the internets truly is serious fucking business!

Of course, in a completely contradictory manner, you can find the autorejoin script at http://scripts.irssi.org/.