It's a common occurrence during a massage. I'm massaging the client, and he or she will pipe up with, "Can you feel the knots? I have a ton of knots in my (insert body part here), my therapist back home told me..." And variations thereof.
I don't play that game, though. Even if it affects my tip (which it HAS, believe me), I won't lie and pander to these people. If I feel a knot, I'll tell you. If I don't, I'll tell you that, too. Even if it crushes your illusions.