Yeah, there was a little spilled coffee under, but it didn't feel like it was sliding. You might be right, though, if the water heated up enough to expand!
Heat makes metal expand? Now look who's crazy.
Just to point it out again, I said water, not metal. And what I meant was evaporate, not expand. You're way off on your quote!
A regular classical phsyicist, you are. 
That depends on what you mean by "microscopic," of course.
The motion of particles constitutes temperature. If you reduce "microscopic" to the scale of the moving particles, than of course nothing is going to be expanding.
I think you're mis-using the word 'microscopic', although I can't think of the right way of saying it right now. But strictly speaking, germs, for instance, are microscopic. Germs do, in some way, expand when heated, so therefore you're misusing the word 'microscopic'. But who really cares, right?
