I think I’ll go back tomorrow and bring a $2 bill and absolutely blow her mind if she is working.......
Or a Susan B. Anthony dollar coin ....
This has been happening to me since cash registers that figure your change due have been in use: Your food comes to $17.30 and give the young person a $20 bill and three $1 bills so you'll get back a $5 bill and 70 cents change, because you'd prefer a 5 instead of more 1's to add to the 8 or so already in your wallet......they hang onto the 20 and before they enter it into the register, hand you back the three 1's and say "...this $20 is enough."
But my favorite is when they tell you your tab is $8.17, you had them a $10 bill and while you're fishing around in your pocket for some change (with a pocket knife, a bottle of hand sanitizer and a small LED penlight running interference), they enter the $10 into the machine and you finally come up with the 2 pennies and they say "I've already entered it into the machine "and then try to hand you the $1.83 change. I ask them to lay it on the counter, I put my 2 pennies next to the 3 they laid down, count them slowly and verbally loud enough for them to hear and then say "...can I have nickle for these 5 pennies?. We won't tell the machine." The reply is usually like "...oh, yes...we need pennies."