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Originally Posted by Radical Edward
no. unless you are Kurashima, you normally only spread at most a millimetre or so of butter on the bread. the mass of the butter will be insignificant and only change the centre of mass slightly. given that the centre of mass is so close to the butter layer, the additional torque as a result of the butter will be minimal and will not contribute significantly to the spin of the butter which will be primarily dominated by the start conditions and aerodynamic considerations.
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It´s a simple game of aerodynamics here (I´m sure someone bright like MrL knows how to google for the name of the principle) but the buttered side is flat (no air turbulence) and the other side not (creating turbulence). Aeroynamically falling toast looks like a sort pyramid, where the tip will want to be up, hence the buttered side it falls down on.