Kayak angler off Irish coast overturns kayak fighting a porbeagle shark (a type of mackerel shark, they are fast, up to about 300 lb), looses a bunch of gear. Reminds me of the Ray Troll paint "Careful what you fish for". It seems that particular angler has targeted that species before and seems to have had quite a bit of safety gear onboard, and got some support from a fellow powerboat, still a reminder to safely tether your gear and be ready for eventualities! Sorry for the link to the "dailymail", but it was the only one I found with actual video:
 
https://www.dailymail.co.uk/news/article-9491773/Jaws-ome-strength-Moment-shark-drags-fisherman-overboard-capsizes-kayak-20-minute-battle.html