Boost that immunity!

Heather Armstrong, at dooce:

My favorite excuse for occasionally being a very lazy parent is, “Oh well, it’s good for her immune system.” As in, even though I just dropped this somewhat damp cracker on the floor and it is now covered in dog hair, I will go ahead and give it to my kid without trying very hard to remove the hair because, you know, it’ll be good for her immune system...

Dirt? Good for the immune system. Dead worms on the sidewalk? The immune system sure could use them. Toilet water? One sip and the immune system is impenetrable.