What happens at a bachelor party usually stays at a bachelor party.
But sometimes, something so big happens that you have to tell someone.
A few guys were partying in New Mexico when they found a giant fossil.
This is the skull of a Prehistoric elephant, called the Stego-Mastodon.
It was buried, along with its tusks, in the sand at a state park.
The bachelor party contacted a professor at a local university, who got a crew to go excavate it.
Paleontologists say this mastodon was 9 feet tall and weighed about 13,000 pounds.