Why Does An Egg Get Sucked Into A Bottle After Heating Water Inside The Bottle?

A stream of hot water runs into a milk bottle. After emptying the water and placing a thorny boiled egg at the bottle top the egg is sucked into the bottle.

As far as i have understood your question, the diameter of the bottle crack gets dilated when you run hot water through it. So it becomes effortless for the egg to move or get sucked inside the bottle.
Comment: My method is that when you put a burning piece of paper in a bottle, (lighted), and put a egg on top, the fire wants oxygen to burn. There isn't any oxygen in the bottle, and the pressure outside pops the egg in.
Answer: Because of the vacuum created by heat.
It get sucked  in because the oxygen decreases making the egg slippery making it fall into the bottle

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