" Thanks, Molly. It’s been a tough night. Some idiot’s started selling Metamorph-Medals. Just sling them around your neck and you’ll be able to change your appearance at will. A hundred thousand disguises, all for ten Galleons!’
‘And what really happens when you put them on?’
‘Mostly you just turn a fairly unpleasant orange colour, but a couple of people have also sprouted tentacle-like warts all over their bodies. As if St Mungo’s didn’t have enough to do already!’
‘It sounds like the sort of thing Fred and George would find funny,’ said Mrs Weasley hesitantly. ‘Are you sure—? "
― J.K. Rowling , Harry Potter and the Half-Blood Prince (Harry Potter, #6)