Rule # 43: Never set a drink down by its rim
However convenient or necessary it may seem, never set a drink down by holding the rim of a glass. The bar might be so crowded that transporting a glass this way seems safer. Maybe it is, but it's not sanitary and will offend your customer. Hold the glass from the neck or bottom, or once you have enough experience, slide that cocktail down the bar and right into your patron's hand.