Is coffee in Diners free after the first one?(both)

All American shows I watch where people eat in Diners, they have a black coffee and the waitress comes back time and again to top up the coffee if the guests wants more.
Do you only pay for one coffee then it is a bottomless cup?

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whowasthatmaskedman · 70-79, M

A few places here used to do that.. I dont think it happens much any more.. But having tasted the road tar they serve as coffee in those US diners, I would suggest they should pay you to drink it..😷