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Our clever friend Feynman demonstrated how to write down the Equation of the Universe in a single line. Here it is:
U = 0
U is a definite mathematical function, the total unworldliness. It's the sum of contributions from all the piddling partial laws of physics. To be precise, U = Unewton + Ueinstein +.... Here, for instance, the Newtonian mechanical unworldiness Unewton is defined by Unewton = (F - ma)^2; the Einstein mass-energy Unworldliness is definedby Ueinstein = (E - mc^2) ^2; and so forth. Because every contribution is positive or zero, the only way that the total U can vanish is for every contribution to vanish, so U = 0 implies F=ma, E=mc^2, and any other past or future law you care to include!
Thus we can capture all the laws of physics we know, and accommodate all the laws yet to be discovered, in one unified equation. The Theory of Everything!!! But it's a complete cheat, of course, because there is no way to use (or even define) U, other than to deconstruct it into its separate pieces and then use those.
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Frank Wilczek (The Lightness of Being: Mass, Ether, and the Unification of Forces)