What embarring moment did you have, just to have a sense of humor about it later?

To shorthand my situation, I was spaced off of Alka-Seltzer cold med. I went to Starbucks to have small Italian soda and cupcake while reading the latest Smallville magazine ( Starbucks was inside the book store). When asked by one barista what size and flavor, I said "toasted mushrooms". Then, I corrected myself to say "toasted marshmallows". He said he knew what I meant. The other barista, I told I wanted "yellow cupcake". Then he asked "you don't want any vanilla on it?" I corrected myself and said "I meant to say vanilla." I explained I had taken cold medicine. Luckily, I seen these baristas around enough. I felt embarred at the time, but was able to belly-laugh about it a few hours later.