Im not really one to write simplistic and jovial lyrics, and while on the surface I can see how Bros is a happy song a celebration of friendship and ones younger years I see a panic in the words. Particularly the bridge, which I think expresses the fear I had, not of growing up, but of growing up without Sadie. I dont know which one of us started having trouble entering the Fourth World first Id like to think it was me because I was a year older, but I dont think our age difference was mirrored in our maturity. Either way, I worried that once we entered reality as budding adults no longer pretending to be raised by wolves and other beasts we wouldnt be together all the time.