My favorite is Abbott and Costello meet Frankenstein(1948)....
with Lon Chaney Jr. as Larry Talbot/the Wolfman.
Bela Lugosi as Dracula
and
Glenn Strange as Frankenstein
And don’t forget Vincent Price as the Invisible man.
( I have this in 16mm for outdoor movie nights)
Chaney: “You don’t understand! Tonight when the full moon comes out, I’ll turn into a wolf!”.
Costello: “You and six million other guys!”.
Glenn Strange eventually went on to play the bartender in “Gunsmoke” on TV. He’s also the guy in the shootout with James Arness in the opening credits.