Ya know, the shark in Jaws didn't really do it to me. Besides the Spin & Marty rattlesnake, I was really scared by the moray eel in The Deep (another Benchley novel made into a movie)....and Jacqueline Bisset made it all worthwhile.
Oh, and the alien in Alien convinced me I'd never travel in outer space, even if I could have Sigourney Weaver to protect me.

-Joe-