So I have this dude I work with that I will call Jim. When I take a walk at 3pm I will often see Jim outside on his phone. I have started making "pssst" sound every time I see Jim. Many times I have snuck up on Jim and made the "pssst" sound and scared the crap out of him. He in-kind tries to scare me. He is not very good at it. I realized today I may be creating a Pavlov response in Jim to the "pssst" sound. He always makes the "pssst" sound back at me. He "has" to make the "pssst" sound when I do it. I think in addition he may be getting the conditioned response of being scared to the "pssst" sound.

TLDR; I love scaring the "pssst" out of Jim.