Every time I hear this observation, I automatically hear Jim Carrey’s voice in my head saying “It’s dead people laughing! Those people are dead!”
I guess he said it in the 1999 movie Man On The Moon and the line has somehow been permanently lodged in the back of my brain for the last 25 years
Parts of it remain indecipherable without the social context, however, as the writer explicitly assumes a mutual knowledge of some set of unspecified rules.