On several occasions, I've seen Richard use a crescent wrench backwards. You're supposed to turn it this way:
http://www.hnsa.org/doc/elect/img/pg3.jpg
so that the adjustable jaw isn't subject to the torque. I've seen Richard apply force the other way, which tends to open the adjustable jaw by leverage, and can risk rounding the bolthead/nut.

Thanks,
Rich Grise