This might be cultural. But at least in Asia, if there’s an unusual sized crowd somewhere, some people will join in just to see what’s going on. Sales, festival, public show, etc.

I’ve gone into a grocery store and left after filling up my cart because the line was comically long. Who would ever voluntarily go to a busier grocery store? I wish there were still 24hr grocery options so I could go in the middle of the night when it’s quiet.