Amish Guitar

I've been thinking there should be a saying guitarists could share not unlike the actor's "break a leg." Perhaps there is one and I just don't know it (I don't "gig" a lot).

How about:

Break a string (or is that too obvious?)

Strum on!

May your barres be true!

Break somethin'!

May Chet be with ya!

Don't @#$% it up! (actually, I have heard that one)

Break a neck! (hmmm... I like the double meaning!)

Slice a finger!

Any other suggestions?