Sometimes you have (or I do) the perfect bourbon or straight rye in the bar.
Examples of perfect bourbons and ryes of recent purchase: Old Weller 107 proof; Old Forester 100 proof; Elijah Craig 12 years old (maple creamy and soft); and Wild Turkey rye.
When these are gone, or just for a change, I like to make my own "perfect" whiskey. I do this by blending.
Tonight I made a blend of 50% Crown Royal, 25% Pikesville rye; 25% mixed Beam Black/Michter's Bourbon/Virginia Gentleman.
Result: a soft rich drink of whiskey mostly rye-accented but with some bourbon smoke and goodness down there. And also ... shucks, it's gone, I'll have to make another.