I gasp in horror (still - 40 years later) when his character slips from the dining table and goes plunging into one of the lights into the former ceiling.
I loved that featurette on the DVD with the actor/stuntman going into details of how the shot was executed.
I saw the best minds of my generation destroyed by madness, starving hysterical naked.

Indeed.if you exclude Ernie Orsatti (Susan's date), since he was not a main cast member.