Not every system can be modeled as simple as physicists wish it to be (xkcd.com/793):

And, yes, in the hierarchy of science disciplines, physics is somewhere at the top of the tree. Agreed, “it’s nice to be on top”. But Randall has hidden another message in xkcd.com/435:

“On the other hand, physicists like to say physics is to math as sex is to masturbation.”