Canadian pop-punk, passive-aggressive Twitter feuds are a riot, eh? It's been three years since Avril Lavigne ripped ex-husband Deryck Whibley's heart out of his chest and filed for divorce, citing "irreconcilable differences" after three years of marriage. Lavigne's now engaged to Chad Kroeger, becoming heir apparent to Nickelback's mountain of Canadian cash. There's nothing rock 'n' roll about that. Sum 41, however, they're still pop-punk as shit.