The author discusses the topic of speed running Monkey Island and how speed runners don’t like random events. The end of Monkey Island 2 has a lot of randomness around when LeChuck appears. The author was asked how this worked and he found the SCUMM source code for Monkey Island 2 and tracked down the code. The code has some other random conditions, but the author shares the core of it. The author also notes that if you’re wondering why SCUMM uses – in variable names, it’s because it started out as a variant of LISP.
https://www.grumpygamer.com/speed_running_mi