This is a HUGE pet peeve of mine. Clearly, the trash was full 10 customers back... But each person after that had a newspaper/old cup/soda bottle that simple NEEDED to be thrown away at that very moment. They could not wait even 10 more minutes to find another trash can that was not already over flowing.
Perhaps there is some underground national physics experiment going on to find if you can fit 50 gallons of trash into a 30 gallon can? If so, the experiment has failed. Please move on. I am simply tired of looking at the extra 20 gallons of trash surrounding the can as I try to order my coffee.