what is something silly you do for no other reason than its just normal for you?

I recently saw an ad for biscoff and I was surprised that people would eat them randomly. The only time I ever eat biscoff is on a plane when the flight attendant gives me some. Don't get me wrong I absolutely love them but I rarely think about it as something I can just go buy in a store. Seeing the ad was so jarring because to me it doesn't feel like something I should eat a lower altitudes