Whether present for flavor or looks (usually both), the humble garnish works hard to differentiate your drink.
Differing schools of thought rule the citrus peel. Many a mixologist has expressed a peel over my drink. But what happens next differs. Some drop the peel into the drink. Some circle the rim with the peel first. Others believe that rubbing the peel on the stem of the glass is the proper next step, as it leaves warm citrus notes on the drinker’s hand and adds to the nose of the drink.
I’ll update as I receive more interesting examples. Comments about your oddest garnishes are welcome!