Yep.
We lived in St Croix, just moved there, and went snorkling. I told my dad and brother (I was 10 at the time) that I saw something fast, long, and silver flash by me. They laughed and told me I was being a sissy-girl.
We were in about 12 feet of water when he showed himself. He would eyeball you, then sink, eyeball you, then sink. I will never, ever, get over that *&^% fish. My dad still swears that I "walked on water" when I swam back to shore. I'm nervous about swimming in the ocean, to this day.
BTW: My dad and brother now also have respect for barracudas

We found out later that the locals had even named him: "Charlie." He was a wise, enormous, very scary fish...