Nasrudin/Joha, don't you just love him?

Nasrudin, ferrying a pedant across a river, said something ungrammatical to him.
'Have you never studied grammar? Asked the scholar.
'No.' Replied Nasrudin.
'Then half of your life has been wasted.' Retorted the dismissive pedant.

A few minutes later Nasrudin turned to the passenger.
'Have you ever learned to swim?'
'No.' Replied the pedant.
'Then I'm afraid all your life is wasted, for it appears that the boat is sinking...'