Mother like Son

  Conlan came home said he talked to the athletic trainer about his chest pains.  He said she told him he had a bruised scrotum. 
I am thinking how did she know his balls were bruised, plus how did that happen when he got hit in the chest?
 Donavan asked " How did you hurt your balls?"
  Conlan starts yelling at him that it is his chest not his balls.
  We then he realized he meant  sternum not scrotum.  Of course he got me laughing so hard that I was unable to pronounce it correctly either.