Speedboats too. No sense at all, these people. My wife threatened dire consequences if I shouted to two boats..... Mind you, I'd have enjoyed the Walrus getting its tusks into their inflatable parts. But it seems quite mild-mannered.
I was told there have been a few incidents:-
1. The walrus tried to haul out on the back of a fishing boat
2. He capsized a small dinghy
3. He punctured a RIB
Got this information from the two ladies who were monitoring him (Welsh Marine Divers Rescue?) so guess there must be some truth in these stories