National Shower With a Friend Day is a holiday that exemplifies how the original intent of a celebration can evolve over time. Initially created to promote the use of shower filters, this holiday has taken on a different meaning for some. While many still observe it with the original purpose in mind, there are those who may interpret it literally by sharing a shower experience with a friend. Considering February's chilly weather, taking a shower can feel like a solitary activity, making the idea of showering with a spouse or significant other a cozy and companionable choice.