Winking at every waking person around you should be optional, but if a needle gets too close to the upper part of either eyebrow, you may be stuck with the look for a few days or weeks. This happens when the toxin that's been injected in your skin migrates near the muscle above your eye (called the levator palpebrae), which can cause the lid to droop. It's not all that uncommon, either — even I've fallen victim to eyebrows that look more asymmetrical than Buzz Lightyear's.