I guess this is ONE way for girls to go wild on spring break . . .

In Key West, 20-year-old Cassi Lyn Clayton of Stock Island, Florida was on a beach, when she saw 21-year-old Madison Pelfrey of Stamford, Florida throw something on the ground.

So Cassi Lyn went OFF on Madison for littering, and started yelling at her.  Rather than settle this by wrestling in a vat of Jell-O . . . like people named "Cassi Lyn" and "Madison" SHOULD during spring break . . . Cassi Lyn decided to BITE Madison's FACE.

She was arrested. She's cute.