Friend 1: *turns off lights*
Friend 2: *is there with us*
Me: Woah! Where did friend 2 go?!
Friend 1: *turns off lights*
Friend 2: *is there with us*
Me: Woah! Where did friend 2 go?!
Listen up, buttercup. The joke plays on racist stereotypes where it is implied that Friend 2 is Black. When the lights are turned off, the joke implies that the friend disappears because they are Black. Get it? I had to spell it out for your dumb brain.