[Verse 1] You walked in and my molecules started moving faster Something in the air shifted when you crossed the room I can’t explain the physics of this kind of disaster But my activation energy just went through the roof
[Pre-Chorus] Hydrogen plus flourine plus you Is that the equation - I don’t know One spark was all it ever took You didn’t even have to look
[Chorus] Combustion reaction! Instantaneous and bright Combustion reaction! I’m exothermic tonight You’re the catalyst I didn’t see coming Chain reaction, there’s no stopping this from running Combustion reaction Exothermic, you and me
[Verse 2] I tried to keep my chemistry in order But you raised the temperature and I’m in the mix Every variable just crossed the line and border Complete combustion - watching how it clicks
[Pre-Chorus] Phosphorus plus Sulfur plus you Just another equation — Is this true? One spark was all it ever took You didn’t even have to look
[Chorus] Combustion reaction! Instantaneous and bright Combustion reaction! I’m exothermic tonight You’re the catalyst I didn’t see coming Chain reaction, there’s no stopping this from running Combustion reaction Exothermic, you and me
[Bridge - slightly giddy, breathless] Science says every reaction needs a trigger Mine was something as simple as a smile I wasn’t looking for an exothermic answer But I can’t reduce this back to neutral now
[Guitar Solo]
Fuel plus oxygen plus you That’s the equation - and I knew One spark was all it ever took You didn’t even have to look
[Chorus] Combustion reaction! Instantaneous and bright Combustion reaction! I’m exothermic tonight
[Final Chorus - key lift, even bigger] Combustion reaction! Flashing like a midnight fire Combustion reaction! You take me higher and higher You lit the spark I never knew was waiting Now we’re burning past the point of fading Combustion reaction— Exothermic, no escaping, you and me
[Outro - fun, punchy] Fuel plus oxygen plus you - (combustion!) Activation energy - (ignition!) Chain reaction, starting now - (reaction!) Complete. Combustion. You.