Random - Santa Claus

So I saw an image on facebook. (this one)

And randomly I thought, how does taking off the mans beard prove that Santa is not real? I mean, one can always shave his beard and change his clothes. Theoretically, a child knows that, and if we were to ever tell a story about Santa changing his clothes, or shaving his beard, then he would believe it until you were to tell him otherwise, and even then, he might think you're lying.

What I'm saying is, that just because we have a different clothes on, or different hair style does not mean that we become a different person. You feel me?