Paper checks and check guarantee services are like everyday things that keep running and running: the iconic rabbit from the battery commercials, the backup fridge in the garage, the commuter car from way back when, and the guy in the movie named after a bunch of trees. Despite Fintechs saying they are "old and in the way," traditional checks keep millions of American businesses running and running. Furthermore, a few financial prognosticators also predicted checks were going to be obsolete decades ago. Nevertheless, paper checks continue to prevail. As a famous author once said, “the rumors of my demise are greatly exaggerated.” Why do checks keep running and running, and what role do check guarantee services play in their success?