Premise: Rollercoaster is a 1977 American disaster-suspense film starring George Segal, Richard Widmark, Henry Fonda and Timothy Bottoms, and directed by James Goldstone. It was one of the few films to be shown in Sensurround, which caused audience seats to vibrate during certain periods during the "thrill scenes" on the rides.
Hypothesis: Richard Widmark was an actor from North America.