OMG, rental SOFAs... OF, you are indeed a genius. Perhaps we can rent out Pixies' members as well, to help smaller groups experience the full potential of this marvellous design. I would be happy to take on the positions of Treasurer and Rental Clerk --- in fact, where the SOFA Slippery-Dip™ is concerned, I'm quite willing to take on any position at all!

As for the safety mechanism, it's quite simple. The stairs, that produce the downward angle that induces motion, simply align themselves to produce a flat surface instead, so that there is no more downward pull. (Think of how an escalator works as you near the end of the ride --- the stairs just collapse into themselves and the ride flattens out.)

Further questions may be directed to the SOFA Hotline at 1-800-SOFA-NOW, where I will be personally answering any and all inquiries.

--- sweetstuff,
SOFA administration team

__________________
"You can't test courage cautiously." --- Annie Dillard