Sentence:  The <WSD>circ</WSD> is progressing apace when, without warning, one of the nurses bursts in from outside, and I mean "bursts" in, as opposed to entering soundlessly and unobtrusively as we all try to (with the exception of the attending surgeons, who "always" burst in), and tells us, "Someone just crashed a plane into one of the Twin Towers." 
Meaning of the word marked with <WSD> tags:  Circumcision.