The last call
Intentional or not, calls from private individuals and businesses attempting to sell you items or services you don’t want are annoying. The worst part about those calls is that no matter how often you politely tell them no, they will not cease calling until it becomes a bother and you’re afraid to answer the phone.
This guy decided to exact his revenge by putting the phone number that keeps calling him on different random billboards. Now they may get strange calls from individuals wanting to acquire monkeys, purchase used cars, or receive various unusual services – see how they like it.