Re: House 5x05 "Lucky Thirteen" - Discussion and Spoilers
I did note that when House cut the onion that HIS eyes didn't tear up.
He kept turning his head away, widening his eyes, then dobbed them with a handkerchief afterwards, so I'm pretty sure his eyes did tear up. Of course, that was before he ordered the "artificial tears to maximize the visual impact of this moment."
"At least once every day I shall look steadily up at the sky and remember that I, a consciousness with a conscience, am on a planet traveling in space with wonderfully mysterious things above and about me."