I tried to move a cardboard box off the top of a cabinet, which left it on for probably years, and it was insanely difficult to remove. I don't know why this happens, but it also seems that my feet get stuck to the floor if I leave them there for enough time and put enough weight on them. It can't be a pressure differential, like when trying to get paper off a flat surface, because it's much too strong, so what mechanism could be behind this?

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    $\begingroup$ Hypothesis 1: You haven't cleaned your floors in a long time and this is all the dirt and grime setting in a some type of glue or epoxy $\endgroup$ – Jim Aug 24 '15 at 16:59
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    $\begingroup$ clean and dry floors don't generally do what you are describing $\endgroup$ – Jim Aug 24 '15 at 16:59
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    $\begingroup$ I think this involves some difficult-to-model physico-chemistry. Cardboard is not a 'pure substance' but a complicated mix of ingredients each with a specific purpose to meet the cardboard's specifications of strength, appearance etc. Over time, some waxy/gluey ingredients (process aids, binders etc) may migrate to the surface and thus the interface between the cardboard and the cabinet surface, thereby creating a 'physico-chemical bond' (for want of a more accurate term) between the two surfaces. That bond may be experienced when moving the box after some time. $\endgroup$ – Gert Aug 24 '15 at 17:11
  • $\begingroup$ en.wikipedia.org/wiki/Cold_welding $\endgroup$ – Asher Aug 24 '15 at 18:03
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    $\begingroup$ Seriously @Asher? When did cardboard and wood become ...two clean, flat surfaces of similar metal and when did a typical household cabinet become a vacuum?? (all italics from your link). $\endgroup$ – Kyle Kanos Aug 29 '15 at 14:29

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