Dream: the laugh comes from under the floorboards

I'm on stage, but the audience is below me, under the floor. I can hear them perfectly, some of them laughing, one just breathing. I do my best bit and the laugh rolls up through the wood like it's coming through water. Then the floor opens and they're all wearing my old shoes, the ones I threw out years ago. Nobody claps. They just nod, like they knew all my punchlines before I said them.