When I was in Hawaii, I was hoping so much to see a shark. I haven't seen a shark on a dive yet and I really wanted too (they are my favorite animals). The dive shop said that I probably wouldn't see a shark in the spots we were going to dive. But guess, what, I did! It was a little white tip reef shark. When I saw it I was so excited, i followed it for a little while and then the thought occurred "I"m following a shark..." - he was pretty speedy so I didn't keep following him, didn't want to separate from the dive group or my dive buddy. But it was so cool! I did 3 sets of two tank dives while in Hawaii, and every day they said I wouldn't see a shark, and guess what, I saw a white tip reef shark each day on at least one of the dives. Most of the time the sharks were chilling under a rock ledge "sleeping" - they were so awesome.
Here's a screenshot from my GoPro footage of the first one I saw: