(Jon of the Clue Crew performs an experiment.) In the egg-in-a-bottle experiment, the flame going out causes a vacuum effect, so the egg is sucked in by the differential in this between the inside & outside of the bottle
[DOC] [TLE] Space machines do not orbit the Earth  The Wild Heretic [PAR] Apr 21, 2013 ... this is the second secret of the vacuum bottle (or thermos): while ... it either 
inside the bottle (if the content is hot) or outside (if the content is ....