They say that opposites attract. That's the case in this song: the guy seems to be falling in love with a girl whose personality is opposite of his.
Howie Day wrote the song with Better Than Ezra frontman Kevin Griffin, who told us the meaning behind it: "That song lyrically is about people who come together despite being different, and this song, 'Collide,' is about a person who is kind of closed off and insular and not a gregarious person, coming together with someone who is. And that despite being two different types of people, you still come together and find a common ground. And then literally colliding into one another and how life has a way of doing that." (Here's our full Kevin Griffin interview