IRC is a classic protocol for online chatting. As such, there has been a lot of people using it over the years, some of which don't agree with each other. As such some users have pranked others by fooling them into executing undesired commands.

Some examples of commands include tempting people to join the channel zero. This is an obscure feature of the IRC protocol and means to part from all the channels. This is often hidden by exploiting the fact that the join command can join several channels at the same time when they are separated by a comma and that servers frequently treat several zeros the same as just one. This leads to bogus channel names like #1,000.

Another common prank is asking a question about two people on a boat:

Two people are on a boat, /part and /quit. /part fell overboard, who is left in the boat?