Extreme situations call for extreme responses. If your office has a distinct lack of Christmas bonhomie, it's time to act. Signs to look out for include: no Christmas party scheduled in. Tinsel and tree still in battered carrier bag. Long, glum faces.

When in this situation, plug in the USB Christmas Tree. It might be wise to check that your superiors are not around when you do so - in case they 'bah humbug' your proactivity. Once plugged in the USB Christmas Tree will change colour every second, spreading Christmas love around the office.