"Grip it good"

The question, What's the difference between a Grip and a Gaffer?, has been used to separate insiders from outsiders for a long time.

Grips move everything but electricity. That’s for the gaffers. Grips work for camera; gaffers work on light. ~Lynda Obst, 'Hello, He Lied'

If you're working on becoming an insider, here's a short film from Mark Vargo which will tell you everything you ever wanted to know about Grips.