re: Worst cocktail blunder you ever experienced

At my wedding I was given an old fashioned that was bourbon, orange juice, and a splash of cherry juice on top. From what I recall it wasn't as terrible as you'd imagine and still wasn't the worst old fashioned I've ever had but stood out as probably the weirdest combination I'd ever been given.

Another wedding I attended the bartender's old fashion recipe omitted the orange peel & simple syrup and replaced that with a shot of Cointreau. Also surprisingly not terrible.