The Mindbender coaster, installed as part of the mid-'80s enlargement of the Fantasyland indoor amusement park. The 55,000 square foot facility grew into a 400,000 square foot, 24-ride, family entertainment centre.
Photo from Wikipedia / "Qyd"

On June 14, 1986, cars on the Minbender crashed into one of its concrete supporting structures, killing three. Since then, there have been no more accidents.
Photo from Library of Cultural Resources, University of Calgary / Image
number ABR939 / Accession Number PR2005.0335/125/3