So, suppose you were out for your morning jog/stroll/bike—whatever you do.
It’s about seven o’clock on a Sunday morning. You’ve just passed the gates to a (gated) community of really nice houses and you’re currently running past a parking lot for a car wash and a Steak N Shake. Then you see it.
On the sidewalk in front of you lies a hundred-dollar bill.
You think, “Cool! Is it real?” It appears to be, blue stripe and all. It’s wet from the sprinklers that ran last night.
You look back at the neighborhood gate, maybe fifteen yards back. If this bill flew out of a resident’s pocket last night as they punched in the code, this morning they’ll probably say something like, “Didn’t I have another hundred in here?”
You look at the car wash and the restaurant. If an employee of one of those places cashed their paycheck for the week and dropped the bill, they’ll probably be out here before long, frantically looking for it.
All this is speculation, of course. You have no way of knowing how the bill got there or what might happen to it.