This is really just a cherry coke made with grenadine. Perfect if you're the designated driver of the evening.
If you order it at a restaurant or bar, make sure the waitstaff or bartender knows what it is; the Roy Rogers is often confused with the Shirley Temple, and vice versa.
Wish I'd drawn this the last time I got ill.
Oh, yeah: if you're watching your sugar intake, this works quite well with Coca-Cola Zero (and not so well with standard diet colas).