Swimming lessons

I started taking my 3yo son to swimming lessons again.  Today was his 4th class and he started to swim by himself while holding the pool noodle.  He can climb out of the pool by himself and he even started to jump into the pool without holding onto my hand.  His progress is amazing.  At the beginning of each class, the instructor, Paul, gets them to do an airplane (front float), star fish (back float), and rocket (front glide).  Today, while my son was doing 'star fish', he says to me with a frown, "Mommy, my ears are not working.  They are turning on and off."  Kids say the funniest things.