I dressed up as a fortune-teller at a Halloween party in a house I shared with a few people. It was a fairly big party, 40-50 people. As a joke, I set up a little booth under a sheet and started telling fortunes.
People went wild for it. Many of them knew it was me (slightly drunk) and they still sort of believed me. People waited in line for 15-20 minutes. I told people mostly jokey things that were positive. I started getting adventurous and told people random things - if they didn't like what I said they were genuinely sad. What surprised me the most was that people would take anything seriously from a tipsy fortune-teller beneath a sheet.