this is a common rumor: glass at room temperature is actually a very sticky liquid that can flow. If you look at those old medieval church windows, you will see that they are thin on top and thick on bottom, which is caused by the flow of glass.

but this is not the case. It is not impossible to say that glass can flow at room temperature, but its viscosity at room temperature is so high that it is completely invisible to the naked eye on the human time scale. In fact, in August this year, there was a special paper to calculate this problem. They concluded that glass such as cathedral windows can only flow about 1 nanometer every billion years.

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(PS: who said he was going to do the glass drop test before... )

Source:

http://onlinelibrary.wiley.com/doi/10.1111/jace.15092/epdf

https://cen.acs.org/articles/95/i47/s-glass-modern-day-researchers.html