Do not take precociously-verbal, two-year-old with you next time M has to have his eyes examined.
Asking M what the pictures on the screen were and hearing a tiny voice yell from the other side of the exam room 'Duck! Hand!' was cute the first two times. Not-so-cute the 10 times after that.
The doctor was very sweet about it, bless her. But I'm fairly certain she, like me, wanted to wring his adorable, cowboy boot-wearing neck. In a good way, of course :)