I'm glad you brought this up, I've been meaning to ask about it too.
I step on the scale daily, and each day it fluctuates up and down, then I finally see a lower number than usual, I immediately do the happy dance. Followed by Debbie Downer's voice in my head, "that can't be a true weight, that can't be right, etc. etc." Then I wait until the next day and if it's still that low number, I believe it!
Why do I have to see it 2 days in a row before I believe it?
I agree, anytime you feel wonderful, celebrate! There'll be other days like this in your future, too!