The whole oil-dipping thing is irritating to me. Restaurants would have us believe its what classy Euros do with their bread...dip it in garlic-doused oil. I've never seen it in Europe. Butter is not a bad thing.
Old Forge pizza? An upstate aberration. Pennsylvania really is two states. The SE 4 or 5 counties and the rest of the Penn State-rooting, inbreeding, possum-eating backwoods pizza-mutating folk.
A chamber vac would evaporate the water which is gluing the sheets together. I don't think that a suction cup in a vacuum is a good model for what we are discussing because it fails to account for the water between the panes.
From MIT http://web.mit.edu/nnf/education/wettability/definition.html Van Der Waals' forces are involved http://www.pddnet.com/articles/2014/09/understanding-unexplainable-bonds
http://forums.egullet.org/topic/142365-nonstick-coatings-on-knives/?hl=+dcarch%20+glass%20+water%20+pressure Cohesion and surface tension. If air pressure was the important force then water between the glass would be unnecessary.