I used to kiss when you'd come home Now you're in places I don't know But I guess that's how it goes Used to share every weakness Now you're keeping a secret There's a stranger in my home Oh, you're cold-blooded So give me something Just anything at all Lately you look at me differently Tell me, who's in your head? Maybe my mind's playing tricks on me Maybe you are instead Tell me, who's in your head? Ah, ah, ah, ah, ah, ah, ah, ah, ah Who's in your head? Ah, ah, ah, ah, ah, ah, ah, ah, ah Who's in your head? Drown my thoughts down the bottle I do whatever 'Cause they're telling me I should run But I don't wanna let go I'm begging please set me free Won't you give me something Just anything at all Lately you look at me differently Tell me, who's in your head? Maybe my mind's playing tricks on me Maybe you are instead Tell me, who's in your head?