How the rare prickly shark figured out how to get out of the aquarium.

It flipped upside-down and went into a hypnotic state, which didn't look right to the visitors and guilt-tripped the researchers into putting him back in the ocean.

"Deep water animals have trouble adapting," said Ken Peterson, an aquarium spokesman. "We were a bit disappointed that it wasn't here longer to connect with visitors face to face."...

The shark is distinguished by thornlike scales and two dorsal fins near the tail. The species is found around the Pacific Rim at depths of 3,000 feet. It is a sluggish bottom-dweller that feeds on fish, other sharks, octopus, squid and crustaceans

Well, plunge some of those face-time-seeking visitors into the ocean depths and see how good they are at adapting.