If you install too many of these, you could feasibly cause the fabric of the universe to collapse. You see, this is a shower shower. It showers your shower, cleaning it after your shower. So if you showered the shower shower, and then showered the first shower shower then you've basically got a shower shower shower ad infinitum, leading to a rift in the space-time continuum which may require you to install new tile after a gate to Hell opens on your floor.
BONUS: We have another picture that really does this project justice. Look at her rapture, her palpable joy. She presses the button and she showers the shower. What an age in which we live!