"The Wrongulator is no ordinary calculator, its actually the world’s worst calculator as it never gives the right answer, ever! If your calculator has been exchanged for this one then every single calculation you’ve entered in it has been wrong. It is perhaps the cruelest practical joke you could inflict on your office colleague and the chances are, without being told, they’ll probably never guess….well not before it’s too late anyway! Mwhahahaha!"
And at £5, it's ideal for a Secret Santa gift.
Spotted any terrible Christmas presents? Send them to us via the comments and we'll feature them next week!