I don't think it's meant to prank people (which honestly sounds like a terrifying prank, unless maybe the presentation is for a very small and really familiar a

I don't think it's meant to prank people (which honestly sounds like a terrifying prank, unless maybe the presentation is for a very small and really familiar audience), but to incorporate that into your own presentations to lighten it up. Like it used to be somewhat common to add a BSOD slide to your deck or similar things.