3. You're storing it in the wrong place (or using the wrong containers)
In terms of beer terminology, "skunked" is maybe the perfect example of a word that is widely used, but entirely misunderstood. The term itself is slang used to describe beer that is "light-struck", and thus tastes and smells, predictably, like a skunk's spray. Wondering whether or not you've ever had a skunked beer? There's a simple solution: walk into any store and pick up literally any bottle of beer stored in a clear glass bottle, open it, and take a sip. Congratulations! You've just had a skunked beer.
It may sound crazy, but skunking starts within minutes of a beer being exposed to light. You can take preventative measures like only buying beer that comes in brown glass bottles (or better yet, cans!), and making sure that you're storing any beer that's not in your fridge in a space where it's covered (yes, even fluorescent lights damage brews!). If you're planning on doing some outdoor drinking, consider using an opaque cup, or check out these entrepreneurial Canadians who want to protect your beer from light right down to the last drop.