Puppy...

I told my wife I had got a puppy, she went mad.

"OK," she said, "You feed it, you clean up after it, and you pay for it, we didn't plan for this "

Anyway, about six months later she greeted me from work with the biggest smile on her face, "Darling, I'm pregnant," she told me.

"OK, " I replied,

Spoiler:

"You feed it, you clean up after it, and you pay for it, we didn't plan for this. "