Recently a long-term patron of my house brought his newbie friend here and as I scared his friend he showed him how to pull a dollar from their pockets and fold and hide them into a small space near where the scare happened as a reward for me doing the scare to them.
I forgot they were doing this, but when I checked back days later the scare-dollars were still there waiting for my harvesting, nice thing haunted houses aren't too well lit up!