Sandbagging and why it can be a good thing

An excerpt from a www.thenorthface.com article written by Ingrid Backstrom about Jim Zellers of The North Face:

A mean trick, perhaps. However, if sandbagees would have been told beforehand exactly how the day was going to go down they never would have left camp — and they never would have experienced the feeling of accomplishing their own personal challenge. The truth is a well-crafted sandbag forces people to look deep inside themselves; it requires every ounce of physical and mental strength, and it results in an adventure that will never be forgotten.

Boom.

I said I wouldn't do it again. But...