Me: Good, but I'm really busy. I've been here for almost 12 hours now with no lunch break and I still have more work to get done before I can go home.
Coworker: That's nice. Did I ever tell you about my favorite pen? I could write a sonnet about how much I love this pen. In fact, I'm going to stand here in your office and eulogize about my pen, ad nauseam, for 45 minutes...
Seriously, why can’t I just tell people to buzz off?