There are many versions of this involving some crazy substitute ingredients, but I settled on this one from Robert Hess because it had a kind of Sidecar vibe that I was liking. And about halfway through the cocktail, I introduced the ginger ale to try that style.
The Suffering Bastard
1 oz. Gin
1 oz. Lime Juice
¾ oz. Bourbon
Dash of Angostura Bitters
Ginger Ale to taste
Combine ingredients in glass and stir. Garnish options include all or some of the following: maraschino cherry, orange wedge, sprig of mint, and cucumber peel. Go crazy if you're making it for something else, but a young bachelor making a cocktail for himself after work might want to stick to those ingredients that can be poured from bottles or pulled from jars (though he will squeeze fresh lime juice, because he is not an uncivilized wretch).
The list of ingredients seems insane, but this works amazingly well. It somehow ends up tasting more like fresh squeezed orange juice than a Screwdriver, and you can't detect the presence of either Bourbon or gin. The citrus and bitters combine with the aromatic liquors to produce a strangely balanced new flavor. WIth ginger ale, it moves from a tart and powerful cocktail to a refreshing icy sipper that would be great in the summer. I'd say mix up a pitcher of this and serve it at a party before you tell folks what's in it. They should be pleasantly surprised.