sir you never can tell Through this line Shaw teaches that life is uncertain No one can predict the future Mr Crampton never expected to meet his children again Valentine did not expect to fall in love with Gloria This shows that human life moves beyond plans and expectations Irony and Wisdom Shaw uses irony to make the message stronger A simple waiter not an educated person gives the final truth of the play The rich and modern characters argue about life but William understands it best His wisdom lies in accepting that life cannot be controlled or fully explained Practical Meaning Of The Message The message also teaches tolerance and acceptance It shows that life love and family are uncertain but still valuable Shaw wants people to accept life s surprises with humor and patience At the end of You Never Can Tell the wise waiter William delivers the message of life s uncertainty His words remind us that nothing is fixed and life always brings the unexpected