Yeppers, and I did it.
Well, I was just thinking of using cash.
I try never to write-in the tip on a bill, since learning years ago that some establishments don’t let the wait-staff keep their own tips, but make them divvy up the tips, and share “equally”.
But if I’m tipping someone, it’s for his or her *individual* performance. So I try to always carry “cash money” for tips.
(That’s a policy that’s come in handy in other areas, as well. Always carry a good supply of cash, in small denominations - at least as long as they let us ;-)
-JT