You know what? I just remembered that they do have a sugar syrup that they use instead of sugar in the iced coffees. I guess it mixes better in the cold liquid. But they are not supposed to use it if the customer asks for Splenda.
If your dad ordered Splenda at the worker put in sugar syrup, then that was his mistake (the worker's, not your dad's). It was not corn syrup and McDonald's does not put sugar syrup in every coffee, no matter what.
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