The Biscuit Tin That Makes You Sign In

It is twenty to eleven at night. The kitchen is dark apart from the little light over the cooker, and a hand in a dressing-gown sleeve is reaching, very quietly, for the biscuit tin. The lid does not move. Instead a small brass bell on top goes ting, and a neat card on the side of the tin reads: all visitors must sign in.

This is the Sign-In Biscuit Tin, an invention that solves a problem no household has ever asked to have solved. It looks like a handsome round tin in pale blue enamel. Fixed to its side is a clipboard about the size of a playing card, with a pencil on a string. The lid stays shut until you have filled in one line of the form: your name, the time, and the purpose of your visit.

The form is short but not kind. Under purpose of visit it offers three boxes to tick: hungry, bored, and just checking they are still there. There is a fourth line for the number of biscuits requested, and a fifth, in smaller print, for the number of biscuits actually taken, to be completed on the way out. The pencil is, by design, slightly blunt.

The inventor, a retired school secretary, says she built it after her household of four finished a full tin of shortbread in a single weekend that nobody could remember. “Every one of them said they had only had two,” she explains. “I did the sum. Somebody was having two a great many times.” Her first version used a padlock, which felt unfriendly. The sign-in sheet, she says, is much more polite and far more frightening.

Early trials were not a success. Within a week the log contained eleven visits from someone called The Cat, a signature that was only a wavy line, and one entry at fourteen minutes past two in the morning giving the purpose of visit as scientific research. Her husband was found to have signed in as the neighbour. The tin, which cannot check any of this, opened politely every time. By the end of the month the family had eaten exactly as many biscuits as before and had also used up three pencils.

The inventor remains proud of it. She points out that the tin has never once been wrong, since it has no opinions, and that the log makes excellent reading on a Sunday afternoon. A deluxe model is planned, with a small rubber stamp that says approved.

The real idea behind it

The joke rests on something true: most of us are poor at keeping count of the small things we eat without thinking. A biscuit taken while passing through the kitchen hardly feels like an event, so it is rarely remembered as one, and four such visits later we would still honestly say we had only had a couple. Nobody is fibbing. Nothing was noted in the first place.

That is why writing things down is such common advice for anyone trying to understand a habit, whether it is snacks, spending or time spent on a phone. The note does not stop you. It simply turns a moment that would have slipped by into one you notice. The Sign-In Biscuit Tin does exactly that, with a bell, and then lets you have the biscuit anyway, which may be the most sensible part of the whole design.