BARE-FACED CHEEK

The festive tradition of what repairmen call “rear-end copying” — office staff jumping on photocopiers to record their nether regions for, ahem, posterity — raises callouts over Christmas by a quarter, says Canon, the copier maker.

To help to cope with the extra load it has increased the thickness of the glass on its machines by a millimetre.

A survey of 600 technicians showed that a third of Christmas work was on broken glass or paper jams of embarrassing images, reports The Times , in London.