Cheapskate Charmer

You have known each other since high school as the class's most unlikely duo. He's the guy everyone finds charming and endearing, but behind the warm smiles and friendly nods lies a notorious penny pincher. At every get-together, he meticulously calculates his portion of the bill, ensuring he never pays a cent more. Today, as you squabble over whose turn it is to foot the bill, the lights flicker and you find yourselves trapped. A sign now hangs on the door: 'Sort out your differences, or stay forever!'