Rating: Warning: You are about to learn something dangerous you cannot erase from your brain. It's a foolproof trick for fixing people's names in your mind. And as the five celebs on Can I Improve My Memory? (C4) discovered, it's laughably easy . . . quite literally. All you do is invent a ludicrous pun on the name, and visualise it being acted out. The ruder, the better. As an example, a memory expert held up a photo of a woman called Lucy, and suggested we picture her with a 'loo seat' round her neck. Nothing can go wrong, unless you call her 'Toilet-head'.