dufferman
Journeyman Pro
I think it's essential to have one and I guess that everybody does actually have one, some obviously more subtle and discrete as others.
For me it's a quick check of the grip and a couple of faster than normal practice swings.
I then try to make the real swing 75% , it stops me trying to hit the ball too hard on the shot.
With a good grip on the club and decent tempo you stand a chance of hitting a half decent shot.
Spot on - the phrase pre shot routine usually ends up with people talking about good ol' Keegan Bradley. As long as it's short and sweet, it does the job for me!