In the "Multo Prank" vlog, Sir Geybin orchestrates a spooky prank to scare his friends by transforming a space with eerie decorations and props. He invites them over under false pretenses, building suspense as they enter the haunted area. The reveal of the "multo" (ghost) elicits hilarious and startled reactions, capturing memorable moments on camera. Sir Geybin concludes by reflecting on the fun of the prank and encouraging viewers to share their own ideas, blending humor with a lighthearted spooky theme.