So, it all starts with this XKCD about the ending of lines lining up in a conversation. XKCD experimented with this a little and had a character limit for a little. That channel worked out pretty well.
A bit later on, someone started <3 thunder -- you take the length of the longest nick in channel, subtract the length of your own nick, and add that many spaces. Then you type <3 thunder.
With the help of a willing op, you get a screen full of people with a perfectly aligned set of thunders. You kick the people who don't get it, kick them when they screw up, and kickban them when they try to disrupt it.
I started this particular one by accident.
This run went on for over an hour.
The traffic was enough for the IRC server to +m the channel a couple of times.