Years ago I went to one of those Halloween haunted house-type things where you walk from room to room and have people in scary costumes scare you. Each room was separated by some plastic flaps hanging in the doorway. For the finale, you end up getting chased by one of the actors with a chainsaw.
As we were running away, I began to feel bad that the actor was getting smacked with the flaps closing behind us, so I started to hold them open. I think I probably confused the actor a little bit. This post reminded me of that experience.