Skull is usually seen as a mark of the negative things. A skull with a cross will represent itself as some danger. And if kids are warned of something, they do it on purposely. Now flew away all the worries related to your kids. And use these pops at specific points of your home near switch boards or electric related things. This will make children alert and resist to go there again. So, thinking a lot to buy or not to buy is a wastage of time. Immediately buy this.