The Dangers of Suction Cups

So I just posted a picture from weeks ago during a football game because I had nothing else to post. Just as I hit "post" , my daughter walked in, and every time I look at her I laugh. You see, she got this tiny little plastic suction cup, when you push it down on a flat surface, it eventually pops up. Yesterday we were hanging out on the couch and my husband asks her "What is on your forehead??" She replies, "Oh, I was just pressing this thing on my head". He says," Oh, don't do that anymore, its making a mark." So I take a look..." A mark! It broke blood vessels! You have a big bruise on your head now!"