The story takes place in some institute, in a dream it was called ITH. A little girl (in another version, there was also a little boy) comes to the security guard at the entrance, because she needs to visit some relatives who work at the institute, but the guard (who looks like Kisa Vorobyaninov) doesn't pay any attention to her. He doesn't let her in, doesn't call her parents, doesn't ask her to wait – he doesn't even see her. Annoyed by being ignored, the girl (or children) calmly enters the institute, takes two items from the nearest room (a small oil heater and a cast iron frying pan, or in another version, some other clever device and a cast iron radiator), puts them in a bag, and, since no one has paid any attention to them, calmly leaves.
After a while, a commotion starts in the institute: in the middle of the day, things have gone missing. The guard is frantic, thoroughly searching everyone, trying to find the thieves. Meanwhile, the children stand outside for a while, their conscience gets the better of them, and they decide to go back. Besides, they didn't plan the "crime" from the beginning; it was just a prank.
As soon as they enter the institute, the children are surrounded by a group of observant students. In different versions of the play, the atmosphere is slightly different – sometimes it's strict Soviet-era gray-brown clothing, including jackets, and in the modern version, it's blue T-shirts with faculty symbols. The guard continues to frantically run around the hall, cursing and accusing everyone, but doesn't pay any attention to the children.
Under the pressure of the gaze of many students, the children first panic a little and try to unobtrusively leave the circle, but they are also unobtrusively blocked. Then they go deeper inside and guiltily take out the oil heater and cast iron frying pan (or the other clever device and cast iron radiator) from the bag.
The guard doesn't see any of this and has already rushed out of the building onto the street.
The children explain to the students and the institute staff who have gathered there that they are sorry, they didn't mean to, it just happened... Of course, they are understood and forgiven.
The last scene is only in the new version: the guard returns, runs up to the window for some reason, looks around, and sees the children. The children, in front of him (and with the silent permission of the students and staff, who already understand that it's a joke), slowly put the cast iron radiator into the bag. The guard's expression changes from "don't make me angry, I'll find everyone, I'll punish everyone!" to surprised and confused:
“Children, why do you need a cast iron radiator?” he says theatrically, as in a classic play.
“Why? To sell it as scrap metal,” a cheerful child's voice replies.