Now Playing: Trump raises hopes 3 US hostages being held in North Korea may be home soon
Now Playing: Son of US detainee in North Korea stays hopeful amid anticipation of Trump-Kim talk
Now Playing: 3 Americans still detained in North Korea as summit looms
Now Playing: Princess Charlotte celebrated her 3rd birthday on May 2
Now Playing: Magician co-producer shares how he shaped magic on new show
Now Playing: Nightmare for passengers as dozens of staterooms flood on Carnival cruise
Now Playing: Paralympian’s inspiring story of strength and resolve
Now Playing: Police dispatched to wrong Waffle House when first calls on shooting came in
Now Playing: Trump talks tax reform as questions swirl amid Stormy Daniels scandal
Now Playing: Evacuations underway in Hawaii as massive volcano threatens island
Now Playing: ‘American Idol’ renewed for Season 2
Now Playing: How to find a healthy relationship with your smartphone
Now Playing: Accused baby kidnapper gives emotional testimony
Now Playing: 6.9 magnitude quake hits Hawaii, causes volcanic eruptions
Now Playing: New questions surrounding Trump’s personal attorney
Now Playing: Parkland students react to Trump’s comments to the NRA
Now Playing: How Amazon is studying body sizes to help make clothes fit better
Now Playing: ‘GMA’ Deals and Steals on Wheels: Nashville
Now Playing: Ron Howard celebrates ‘Star Wars Day’ on ‘GMA’
Now Playing: Charlize Theron opens up about ‘Tully’ live on ‘GMA’