Sharks can be formidable predators, but when they're flipped upside down, many species enter a trance-like state, known as tonic immobility, and are as helpless as a beetle on its back.
Tonic immobility is "as close to hypnotising a shark as you can get!" Joel Gayford, a doctoral candidate of marine ecology at James Cook University in Australia, told Live Science in an email. "The animal completely stops swimming, and the only movement it's making is slow rhythmic breathing."
