Ghostbusters
- Burnt marshmallow for Stay Puft
- Maybe some sort of sour scent for the ectoplasm
Klowns
- Forest/Trees assuming the maze starts with the big top in the forest from the movie
- Popcorn for the popcorn gun/popcorn creatures
- Cotton candy for the cocoons (a no-brainer)
Us
- Salty sea spray for any potential scenes that take place on the boardwalk/beach
- Forest/Trees for any potential scenes that take place outside the house
- Smoke for any potential scenes that include a fire gag with Pluto