Jaws
My first time ever seeing Jaws in the 31 years I've lived. Now, I'm no stranger to Spielberg, I've just never had the opportunity to see this movie before.
I've seen a variety of shark films in my life, yet somehow, the one that started it all gets it right the first time.
Also, it's always a great feeling when you finally get around to watching a film and it lives up to the hype.