The attacker, only identified as a 24-year-old man, is arrested on the spot and is being investigated on suspicion of attempted murder. His motive was not immediately known.
Earlier this week, Kelly sparked widespread criticism by defending the use of blackface as part of Halloween costumes during remarks on the show.
The third installment of the Thor series, "Thor: Ragnarok," pulls in $122.7 million in North American theatres and a global total of $306 million over the weekend.
According to the industry group for scares, the Haunted Attraction Association, sensory deprivation, personalised experiences and interactivity are the top trends this year.
Halloween is more than running around in a costume screaming trick or treat. It's one of the oldest holidays in which people of all ages dress up and express their views.
The White House also weighs in on the phenomenon saying the sinister sightings, that have led to about a dozen arrests, should be taken seriously.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2022 TRT World.