
Funny ! The sad part is a lot of people are like that !
If you really want to have some fun go to a Toys R US / Fast food restaurant where teens are working .Wait for them to ring up your order hand them your money.. WAIT for them to enter the amount you gave them into the register ,THEN hand them some extra change and say ,"oh , here use this too please." They will just stand there and stare at you with a dazed look in their eyes with NO IDEA how to count up

I even had one ask ME how much change they should give me !!
I also went to TRU one time and gave the girl $75.00 for a $50 and some change total , then gave her some change after she had already rung it up because my son wanted some quarters to use ( I did it so I would get 3 quarters back) She was so flustered she gave me back the amount I had paid her $75.00 + the change ! She is lucky I am honest ( and I knew the manager) so I handed it back to her and showed her how to figure it out then told my friend he needed to have a seminar on how to count !
I made sure I taught all my kids how to count up manually. Machines can break then what the hell will they all do