I remember some years ago picked up my son I had Coffee & Doughnuts pulled out a $10 spot threw it on the counter
My boy had Paypal some crap off the phone he bought Energy Drinks & pack of Gum
Then told me let me pay for your coffee & doughnuts too ..
He had no $$$ in his pocket he just scanned his phone with the clerk.
On the way home I asked him ya aint $20 bucks in your wallet.
He said I dont carry Ca$h pays with phone or a card.
I said what if ya meet a nice gal someday take her out 4 supper wouldnt ya like have $10 spot leave waitress a tip .