Went to a local chilli festival last year. Stopped at a stall which had the usual set-up, sauces of varying degrees of heat in wee bowls and crackers or cubes of cheese on cocktail sticks to dip in. Worked my way through them until I got to the Carolina Reaper. Mother of Christ, I thought I was dying.. Had to sit down, hiccuping, as the tears rolled down my face, jabbing the cocktail stick into my thigh in an attempt to distract me from the confusion and agony going on in my gob.
Also, had some wasabe in a (long-gone) Korean/Japanese restaurant in Manchester. Each mouthful was like a little internal explosion in my nose. Weird.