I love to screw them up like that. Especially when the amount is like 16.47 and I give them a 20.00 then wait till they tender it and say, "oh wait a second I have some change." then give them two quarters. Blows their minds to have to figure it out.
Schools are starting here too, but online right now and some say after Labor Day they will go back to in person classes. There are several law suits pending before the courts over the back to school issue here in Texas.