Melissa Dahl talked to some people to find out Why You Keep Mishearing That Taylor Swift Lyric:

“There’s a piece of what we understand that comes from the sound that comes in our ear,” but another piece of our understanding comes from our minds — from our expectations, in other words. It’s easy to see how this explanation applies to many misheard lyrics, specifically the most-often cited one from Jimi Hendrix’s “Purple Haze,” which contains the lyrics “Excuse me while I kiss the sky”; people often mishear that line as “Excuse me while I kiss this guy.” It makes sense: People are more accustomed to hearing someone talking about kissing some guy, less so the entire sky.