Intrusions: ems or parens?

I have an inordinate fondness for–some might say obsession with–intrusions.

Not physical ones. I don’t get into breaking down doors or smashing windows. I’m not talking B&E here. I mean written ones, like the one in the first sentence in this post.  That clause in the parentheses is an intrusion. Why did I choose em dashes over parentheses? Continue reading “Intrusions: ems or parens?”