Flashing Room
ON LEAVE{{IN=
IN DIMROOM}[80 70 80 50 80 30 80 10 80 70 80 50 0 70 80 50 80 0 30 80 10 80 70 80 50 0 100]
FOREACH}

you can change ON LEAVE to ON ENTER or ON SELECT or anything like that. And you can change the numbers, Note: 100 is normal, 0 is black.

hope this was helpful! :D
;Credit: shadow99