Movie Theater Pranks?

My friend and I have this idea of going into a movie theater like 10 minutes before everyone shows up and putting a stuffed animal in every seat, looking like they are watching the movie. Unfortunately, I don't think that we will be able to sneak in 100+ stuffed animals, so I'm trying to come up with something else to put on peoples seats. A Hershey's Kiss? A picture? Is this a good idea/would it be funny? What else can you think of to put on people's seats?