When my kids were about 8, 10, and 12, we took them for a week on Lopez Island in the San Juans in Puget Sound. I took the kids out in a rowboat on the glass-smooth water. We saw a beautiful, long Portuguese Man-of-War, trailing down several feet in the water.
Then the kids said excitedly, "Dad, look! Some fish are following us!" I looked, and the fish were sharks, several of them, each about 3 feet long. I didn't tell the kids the fish were sharks, but I did tell them to keep their hands out of the water. The sharks followed us quite a bit of the way home. They seemed curious, not aggressive.

Later I found out they were pupfish, an harmless variety of shark that tend to be curious like puppy dogs.

Now those kids are over forty, but I'll always remember that lovely afternoon in the rowboat with them. And I admit I was a bit scared, but I did my best not to let the kids know it.

-Joe-

Baby Shark thread (click)