That very moment when mom left you little at the checkout in the store, and she returned to the sales floor for a while.
Agree that monsters under the bed are nothing compared to when mom left little you in line at the checkout and suddenly went deeper into the hall because she forgot to take something. One gets the feeling that the cashier at this moment seems to be speeding up even more.
The guys from this video remembered that childhood fear, making fun of it in a short sketch.
In the end, however, the “child” ran away, but we remember that we did not have such an opportunity.