A great deal of creativity is about pattern recognition, and what you need to discern patterns is tons of data. Your mind collects that data by taking note of random details and anomalies easily seen every day: quirks and changes that, eventually, add up to insights.
I don't mind if the couple next to me is tense or the kids are whiny. I'd even be happy to hear an honest argument, evidence of thinking. I'd like to know these teeth-perfect families don't just buy each other stuff but just occasionally can talk to one another.
Most people have their best ideas when they take their minds away from problems they're trying to solve.