I believe that this is the soliloquy of a guy who's returning from a pub. Lyrics in chorus are agressive and music is cheerful here. On the other hand music in verse is confused, heavy to listen, twisted - I have similar feelings when I am drunk. And there are lyrics consist of self-pity, narative jumps from topic to topic, he's speaking about revenge constantly. To proof my point I have to refer to the fact that he harmed himself when he was trying to hit someone (with a "sword" while he was prowling under the amber streetlamps) . Typical drunken story.