I used to work in a museum and art gallery and one of the galleries was unstaffed, but there was a one way mirror through to the admin office and the staff who would field the phone calls for the building would just be able to keep half an eye on the gallery while they worked. One April 1st, during lunch, there was a lassie working the phones on her own and through the one way mirror she sees a bloke come into the gallery, drop his pants and lay a big turd in the middle of the carpet. For real, not a wind up of any sort.
She’s obviously quite distressed, but every one she calls thinks its a prank, more so because she’s exactly the person you’d expect to play a prank. So everyone she calls is just laughing at her, and with it being passed mid day laughing at her even more, and the more upset she gets the more convinced everybody is that she’s pulling their leg.