And by ‘jetpacks’ I of course mean Scotish rockers We Were Promised Jetpacks. Listen carefully, and you can here a favorite here at Schrödinger’s Blog ‘Keep Warm’ playing over the first 25 seconds:

I’m not 100% positive, and the song isn’t on the soundtrack, but I’m fairly certain I recognize the song. Kick-Ass is in theaters April 16th, and the comic book was fantastic, so expect good things!