I probably shouldn't have used the ME prefix. ME is an event prefix that has not been documented for a long time, but is still supported.

Code:

on ME:*:JOIN:#chan: {
  .timer 1 5 if (AnotherNick ison # ) msg $!v1 Hey You
}

on ME:*:JOIN:#chan:

In red is ME, the event prefix which will cause the event to be triggered only by yourself

In blue is the user level, which in the case of the other thread is SITEBOT


To not use the ME prefix, you would use this instead...
Code:

on *:JOIN:#chan: {
  if ($nick == $me) .timer 1 5 if (AnotherNick ison # ) msg $!v1 Hey You
}


This is what I should've used then.