Two theoretical physicists are lost at the top of a mountain. Theoretical physicist No 1 pulls out a map and peruses it for a while. Then he turns to theoretical physicist No 2 and says: "Hey, I've figured it out. I know where we are." "Where are we then?" "Do you see that mountain over there?" "Yes." "Well... THAT'S where we are."
Because sometimes theoretical physics can be detached from how things really are.