"Excuse me, barista, but there seems to be a bug in my coffee." (via)
When I used to work in a coffee shop during college, I was extremely proud of my ability to make something that kind of resembled a four-leaf clover in the milky foam of favored customers' cappuccinos. Then I'd hand the drink over and say, "This is for good luck," and they'd say, "What is?" and I'd say, "That four-leaf clover there," and they'd say, "Oh, is that a four-leaf clover?" and I'd say, "Yeah, can't you tell?" and they'd say, "I guess it does kind of look like a four-leaf clover."