You are at your favorite little hole-in-the-wall Chinese restaurant, located in the not-so-great residential/industrial side of town. The sign says "Chinese Food." The parking lot is poorly lighted. It is a little mom-and-pop operation with a small bar, three two-ups, a large round table, and five four-ups. It is a long, narrow place. Facing into the restaurant, the tables are down the left side, the front door, bar, and kitchen are down the right side. The bathroom and rear entrance is at the very back. This is the kind of place where the owner's kid sits at the very back of the restaurant, at the last table, doing his homework each night. They have two menus - one in English and the other in Chinese with English subtitles. You always order from the Chinese menu.
Tonight, you are a party of 10, and Mom puts you at the round table, opposite the bar, about 12' from the door. There are three couples, two singles, and two kids in your party. If the chair closest to the bar is at 12 o'clock on the table, you are seated at 7 o'clock, against the wall, facing the door. Your buddy, who is also carrying, is seated at 5 o'clock, against the wall, facing the bar.
It's about 9:30pm, and almost time to close. Your party is the only one left in the restaurant. Everybody is busy eating. Mom is cleaning up, by the cash register, behind the bar. Pop is back in the kitchen and unaware of what's happening on the floor. Son is at the back of the place.
A man walks in. He is wearing expensive cross-trainers, gray sweat pants, and a dark blue hooded sweatjacket with the hood up. He leans against the bar, facing away from you, but directly behind a member of your party. He is not there to pick-up carryout. You hear him ask for change for a $100 bill. No one but you and your carry buddy seems to have heard the exchange. The kid between you is oblivious. The others at the table seem unaware. Mom turns to the cash register. The guy looks around nervously.
What do you do? I'll tell you what actually happened, later.