Why it worked
The video likely went viral due to the shocking and unusual nature of the event, combining a morbid costume with a sensitive location like a hospital, creating a sense of unease and morbid curiosity.
Summary
A 26-year-old man, Leon Gillespie, dressed as the Grim Reaper and stood on the roof of a hospital in Wales, UK, for an hour, causing panic among patients and staff. He was eventually brought down by police and firefighters and fined for disturbing public order, claiming he was dressed as a crow.