Lately on Facebook, I have seen a number of repostings of a video in which some people quickly set up a fake gravesite on someone's lawn and proceed with a religious ceremony. The video includes the shocked and puzzled reactions of the homeowners. [No, I will NOT post a link to the video.]
It is all a variation on the old theme of Candid Camera: do something mean or cruel to unsuspecting people and watch (laugh at) their reactions.
I always felt uneasy about Candid Camera and didn't much care for it.
It is a sick form of humour. It is a power play that says, "I can do something to you and laugh at you."
It is a low form of humour that gets its jollies from putting other people down or putting them on the spot.
And it isn't funny.