The Monkey Island SCUMM Bar: Trivia: Guybrush: A Turn Off

Some versions of “The Secret of Monkey Island” – Amiga, EGA, VGA floppy – still used the old SCUMM interface that included the “Turn on” and “Turn off” verbs. Both were superfluous and never required, but there are still two scenes where using them produces dialogue not seen in other versions.

Source: The Mojo Comments.