Seem to recall one attacking a girl a year or two ago. It was well covered by the media at the time so look out.
I think there is relatively little evidence of aggression from these animals, this one was pretty relaxed and probably had a belly full of fish and penguin. Still, ending up as a snack for a fellow carnivore is a great motivator during those water starts.
And doesn't anyone remember 8-Below, when the leopard seal comes out of the whale hide?
Now that was a scary animation.
The day the photos were taken there were about sixty people at the beach and probably about 25 kids and adults in the water. There had been about four people windsurfing but when I went out the wind died and I slogged back to shore about 600 m down wind and had to walk back up the beach. The leopard seal had parked itself about 100m away from the beach goers and while it did bark at the occasional dog walker that got to close it never seemed aggressive.