It seems you've stumbled upon a rather... unique case. Trust falls, by definition, involve one person falling backwards in a group of people, relying on the team's collective trust to catch them. However, it appears you've managed to trust fall in the shower, which, uh, isn't exactly how it's supposed to work.
We're still researching this phenomenon, but in the meantime, try to:
• Re-evaluate your team building strategy.
• Invest in a better shower.
• Read up on the basics of trust-falling.
What are the consequences of trust-falling in the shower? Advanced Trust Falling Techniques for the Dedicated