It is no secret that many teenagers of the 90s secretly took video cassettes with "erotics" from their parents, and after viewing they returned to their place, pre-wrapping the film for the right moment. But even though I did the same thing, I was constantly falling. And for each such offence I was punished with house arrest for a day or two, depending on how long I was out. A few years later, I realized my mistake. It is all the fault of a “sweeper” who has one special function. Before spitting out the cassette, he automatically wiped off the film five seconds ago, shifting the already wiped boundary. And by this "shift" my father knew exactly that I was taking his tape. These damned five seconds cost me hours, or even days of “freedom.”