Strange fruit?

I think my son is taking his liking for Lego a bit too far...he's just told me that he was gazing up at a tiny piece in the light and then dropped it - into his mouth. He "coughed a bit", and then swallowed it. He was very disappointed: "it was quite an important piece". I told him he'll have to look out for it over the next couple of days; he wasn't half as amused as I was...