You get this item in the Lucky Dip. There is no way to keep track of how many you have, but if you collect 100 of these rare little buggers The Watcher will show up as a Improbable Event while your in the Jungle next and will be in a thong.
You'll then have a 'Wierded Out' buff that like the Joker buff will add or subtract from your attack and defence, but it will change every turn. With the modifier being x1.5 to x-1.5. Durration 10-20 Rounds.