On the other hand, I left $10 on top of a $50 takeout order at a local Italian place and the bored, empty-handed young waitress just sat there watching me while I struggled out the door with pizza boxes and a couple bags. I resented her for her smugness and entitlement. Plus the order was wrong, as I found out later.
Why on Earth am I expected to hand money over to people who are doing literally nothing but processing my credit card for payment? I've worked in food service, where I learned how hard it is and to never disparage employees at the point of service, but I cannot wrap my head around this selfish mindset of sit there and do nothing and expect people to hand over cash.