'Plagarism' and conversation

I’m feeling oddly guilty. At lunch today, one of my homeys started going all Thoreau on us. I, being me, led the opposition. Now, I more or less stole most of the wittier sayings from www.mrlizard.com about this topic. Perhaps the board is getting to me, but was I expected to point out, “Oh, yeah, I didn’t think up that quote,”?

Yes.

But you’re not in bad company, either.

You should be more original.