Singer Matt Berninger had the following to say about “Don’t Swallow the Cap” in an interview given to Under the Radar magazine: It’s funny, because people have assumed things about that. One person thought it was “Don’t Swallow the Cat,” and they thought it was an Alice in Wonderland reference. Some people thought it was a druggy reference. And some people have interpreted it as “don’t swallow the cap on a mushroom,” like LSD. I honestly don’t know. It sounded good.