Two guys in Houston were at a McDonald's in July and they noticed a blank wall. So they made a fake ad featuring themselves, had it printed, snuck it into the store and hung it up! Now, almost two months later, it's still up!
He makes a good point that there weren't any photo ads featuring Asian people. So, not only did he point that out but nobody working at McDonald's noticed that it was an amateur made ad hung by a customer! Nice work!