When my youngest was around 4 they were visiting neighbors who have a pool.  One of the children they were playing with (age 9 or 10) had a cell phone that they claimed was indestructible.  This must have intrigued them for later the other child left the phone near the pool and apparently my child decided to test out the others claim.  So they picked the phone up and threw it on the concert, where it split into pieces and then landed in the pool.  Needless to say their claims were proven false.