Let's see:

"We tune because we care!"

"Tune it or die ... trying." (This is better as a t-shirt slogan or bumper sticker).

"I've got it surrounded!"

"I'd tell a tuning joke, but I've got more class than that. So I'll tell a dirty joke instead."

"Maybe we'll just do this next fiddle tune a cappella." (I actually once took part as part of a band, accompanying an "a cappella blues" performance, complete with non-instrumental intro and a break.)

and the old favorite,

"I don't understand. It was in tune when I bought it." This is especially useful with antique instruments.

Bob Clayton