The reason why you can't spit it out after swallowing a light bulb

This is because people's mouths are full of "saliva". When you put the light bulb in your mouth, your mouth is full of light bulbs. At this time, there is a thin layer of saliva between the bulb and the mouth, which has a strong "adhesion" to the bulb. When you try to take out the light bulb, this "adhesion" plays a "resistance" role, and it is difficult for you to take the light bulb out of your mouth.

An obvious truth is: put some water in the middle of the second layer of glass, and the glass is difficult to separate. But never try to put a light bulb in your mouth.