There a number of quasi-fast food restaurants around me (barbecue, fish and ships etc) where you order and pay before getting the food or really any service at all. If you pay by credit card, there's a tip line on the receipt. I absolutely refuse to tip anything in those circumstances since it seems absurd to tip before anything has yet happened. If they want something like that, they should have a cover charge to get in the restaurant.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13