I don't think Adam would have ridden this one to school.

"The fossil skull of Dunkleosteus terrelli, which had the strongest bite ever (Michael LaBarbera /PA)"

"A prehistoric Jaws that terrorised the oceans 400 million years ago had the most powerful bite of any creature yet known, scientists have discovered.

The ancient sea monster, known as Dunkleosteus terrelli, could bring its fangs together with a force of almost 5,000kg (11,000lb), making it almost four times more powerful than Tyrannosaurus rex.

Its jaws were arranged so that the bite force would have been focused into a small area around the tip of its front fangs, producing a remarkable pressure of 5,600 kg per sq cm (80,000lb per sq in)."

[snip]

"In the research, published in the journal Biology Letters, Dr Anderson and Mark Westneat, curator of fish at the Field Museum in Chicago, used a fossilised skull to reconstruct the musculature of its formidable jaws. They found that it had a unique jaw mechanism based on four rotational joints working in harmony, which not only generated vast force but also gave it a swift bite.

It was capable of opening its mouth in just a fiftieth of a second, creating a powerful suction force that would have drawn prey into its maw. It is unusual for a fish to have both a powerful and a fast bite."
(Via alternative hippopotamus).