Love the movie...just love it. I don’t really care that it is “bad science”...:)
The characters in it are wonderful. I watch it about once a year just for kicks, even when you now see how hokey the shark looks at the end of the movie.
If you put the choice to people “Would you rather be eaten by a giant shark, or fatally hit by a bolt of lightning?” most people would run to the nearest open field in a thunderstorm!
When I saw the movie in 1975 at the theater, I was sitting between two friends of mine. They could not understand why, at several points of the film that were supposed to be scary, I had burst out laughing. But they had not majored in zoology, with a speciality in animal behavior.