Forgetting to lay out your towel before hopping out is one of them. There's nothing worse than having to drip your way to the linen closet leaving wet footprints all over the floor. This habit is magnified in the winter, when you shiver and soak the cold floor on the way to the closet.
There's also the annoyance of running out of soap, shampoo or other hygienic necessities while in the midst of bathing.This, if you're wise enough to stock these items in bulk, is easily remedied by carefully dashing to the cabinet and snatching the needed item back into your steaming shower. Those that are not prepared usually make do with hand soap (if they're lucky).
But the one true bathroom annoyance that really ticks me off is: hair product mix up. As a girl I feel the need to invest in my hair products. One cannot achieve good hair by skimping on something as vital as shampoo or conditioner. Therefore, I spend a reasonable chunk of change on attempting to tame my locks. Which is why when I reach for the shampoo and mistakingly squirt out a mini hill of conditioner I see red. You cannot, cannot condition your hair before cleansing your roots! It would defeat the purpose of the shower. It's shiny, bouncy hair one wishes to achieve. Not stringy, oily hair.
It is almost an impossible feat salvaging your error. No matter how hard you try to block the pulsing water with your back while simultaneously attempting to scrape the mound of conditioner off your palm back into its bottle, some of it is still wasted. And as it whirls down the drain without having touched human hair first, I can't help but mourn its loss.