Lots of them, when I went snorkeling in Aruba. I'd never been snorkeling before, and I was nervous that I'd feel claustrophobic and that it'd be difficult---but it was surprisingly easy, and once I got a load of the gorgeous fishies, I didn't want to get out of the water. These were three of the most common fish I saw:
From top to bottom, Blue Tang (GORGEOUS fucking fish), Parrotfish, and Sergeant Major (this was the most common).
The second time I went, one of the crew jumped in next to me and threw fish food so that the fish absolutely surrounded me; can you imagine these beautiful creatures brushing up against you and coming right up to your face? It was awesome...