Whose Itchy Hands?

Someone with itchy hands stuck the rubber swimming cap onto the bathroom tiled wall when she was having her shower.  The 2 older monkeys always take forever to shower... almost an hour, claiming that they want to poo but I've caught them sitting on the throne enjoying their story books. And when they are inside the shower stall, they do  all sorts of monkey business!  


Who with the curious mind and itchy hands do you think did this? This is hard to guess haha... and that's a give-away already when I say that.