I once managed to calculate that the radius of the Sun was so big that it engulfed the entire solar system. Another time, I proved that a comet was travelling at almost twice the speed of light as it intersected the Earth's orbit. I once embarrassingly implied that a very small meteorite that barely managed to get through the atmosphere hitting the Earth would create a crater with a diameter of roughly 2 Earth radii. Oh dear.
However, I believe that this graph made in Computational Physics (supposedly graphing a forced harmonic oscillator's motion) is one of the sexiest mistakes I've ever made:
So, has anyone else ever fundamentally screwed over the laws of physics and lived to tell the tale?