Nichijou Sekai no Serious Daihyou

 is a musical composition from the Nichijou soundtrack. It was used in Episode 1 (Button), Episode 2 (Part 5), Episode 5 (Part 19), Episode 11 (Part 47), Episode 12 (Part 48), and Episode 18 (Part 74). True to (at least the English part of) it's name, it was used in rather tense, serious situations.