From the submitter:
wife: Honey, I want a dual showerhead so we can shower together. husband: Well, I have been trying to use up every plumbing part I have. wife: Ooh, and I can use my hair net to stop the leak
Seriously guys, get your s**t together. Water of different temperatures can legally touch. It's okay, I promise.
For a few cents more you could buy the fancier, more complex version. It's a little crazy though.