Yippee ki-yay!

Macroctopus maorum and Isurus oxyrinchus

This was inspired by an actual event captured by a New Zealand marine biologist featuring an interesting little interaction between a short-fin mako shark and what looks like a Maori octopus (unconfirmed): https://www.auckland.ac.nz/en/news/2025/03/1 It's also interesting that the mako—being the fastest shark up to speeds of 46mph (74km/h)—could have probably zoom zoomed the octopus off their head, but hadn't yet at that point. And large octopuses have been known to snag smaller sharks for snacks, but this one is just riding shotgun.

Mako sharks are a fairly large shark in addition to being speedy, up to 13 ft (4 m) in length and weigh 1,260lb (570kg), but more typically 3m (10ft). They can be found all over the world's oceans with the exception of the very far north/south polar waters. Sadly, like a lot of shark species, they are listed as endangered. They are endothermic, maintaining a body temp that's 7-10°F (4–5.5°C) aiding their speedy lifestyle. They can live to around 30 years and give birth to live pups.

Maori octopuses are one of the largest octopus and most common species in Southern Australia/New Zealand's coastal waters, reaching an arm span around 9.8ft (3m) and weigh as much as 26lb (12kg). All octopus species have venomous bites that they use to tenderize their meals for easier digestion, and most are fairly harmless to humans. The Maori octopus is in that mostly harmless category (unless you're a crab, sorry crabs). As with a lot of fellow cephalopods, many creatures find them delicious including seals/sea lions, toothed whales, sharks, and albatross even though they can be a formidable meal. In fact, in one case(https://www.livescience.com/59309-dolphin-choked-by-octopus.html) the Maori octopus ended up choking their dolphin attacker to death (alas, the octopus did not survive the ordeal either).

As for the sharktopus, I'm sure these two became dear friends.