This video from the USA says about itself:
Entangled Humpback Whale Frees Itself Off Dana Point As Whale Watchers Cheer
4 March 2016
Whale watchers aboard a catamaran with Captain Dave’s Dolphin and Whale Safari were viewing a humpback whale when they noticed that the whale seemed to be playing with a shrimp trap buoy located about 2 and 1/2 miles off the coast of Dana Point, California. Several minutes later the whale dove down and entangled itself around the tail.
Scientists witness extraordinary feeding event as humpback whales feast on krill ‘super-swarm’: here.
Why Humpback Whales Protect Other Animals From Killer Whales. It’s possible humpbacks are rescuing seals, sunfish, and other species by mistake, but there’s a chance they have altruistic motivations: here.