Some examples:
A ring slides on but gets stuck trying to take it back off.
A kid puts his head through metal slats on a railing, but can’t pull it back through.
A girl gets her body in a clothes dryer, but can’t get back out.
If we can fit forward, shouldn’t we be able to fit backwards, too?
In: 358
In general, a lot of things fit only in one direction.
For example, a sawtooth-shaped object fits easier in one direction because the gradual increase in size makes it easier to deform whatever the object is trying to enter, while the sudden increase when moving back makes it harder to pull back.
For your specific examples:
* Putting a ring on your finger is easy because you have a gradual increase towards the knuckle, which is the largest part of the finger, while you don’t have this same graduality when taking it off.
* Putting your head through bars is easy since your head with its curvatures will ease your head in the direction it needs to go through them. Taking it out is hard because your chin doesn’t have the same curvatures leading you to the optimal head rotation. The same goes for the body stuck thing.
Also, on top of that, keep in mind that panic is a real thing which does make some operations harder.
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