Willy Wonka (Charlie and the Chocolate Factory) with Prep Time vs Batman

Willy Wonka has decided to give six golden tickets that anyone lucky enough could win. And one week before the deadline to visit the chocolate factory, Alfred bought some chocolates to have in the Batcave, Batman opened one and saw a golden ticket, Batman decides to join since he wants to confirm suspicions whether the mysterious Wonka has any relation to the Mad Hatter and joins the tour, informing the factory of his assistance.

So 5 kids, and an adult in a bat costue meet Mr. Wonka and enter the factory, like in the original, Willy wants to setup things for Charlie to win... which means making Batman lose the contest.

Willy got a week to think, what possible floor or preparations he could make to take out the Bat?