One particular need we all have is the need to relieve ourselves at semi-random intervals. Most people can put these urges off for a few minutes when circumstances require it. (Or, with the right yoga, and a will of iron, hours.) But outside of tired jokes about women going to the bathroom together, humans generally don't synchronize our bathroom time with each other, and indeed there's all sorts of etiquette on how to not do that.
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"You look tense. You tense? Why you tense?"
The only real exception is during massive group events where everyone is either restricted from or trying their best to avoid using the bathroom until the event is over, like at the movie theater or during a concert -- or the Super Bowl. The largest televised event in the world, the Super Bowl can attract significant percentages of a city to all watch the same show, inadvertently syncing the bathroom habits of millions of people. Rumors have long circulated that in the minutes after the Super Bowl, water pressure drops dangerously in cities around the country as everyone uses their toilets at once.
And it's (sorta) true! Both potable water and sewage flows increase significantly during halftime and the minutes after the game. The danger part of the rumor is definitely overblown, the dip in pressure only around 10 percent or so, which isn't that different from what can be seen every morning or night. But that is enough for engineers to have to be at the ready with standby pumps, as well as cause a noticeable dip in reservoir levels, accompanied by what we can only imagine is a really hilarious noise.
"Did ... did anyone else just hear a 'SPLORP' sound?"