Daily showers. Medical investigations have proven time and time again that someone who showers daily is really no cleaner or hygienic than someone who showers every other day, and showering too much can actually cause skin damage. It literally wasn’t a social norm to shower every day until fully fitted bathrooms become more common. And every time this is pointed out, people just say “Nooooo that’s groooooss!”

Obviously some people live in very humid climates or have extremely physical jobs, but the average person doesn’t get much benefit from showering once a day, certainly not more than once, which again, is bad for your skin.