Thanks for reminding me of the one I saw in yesterday's NYT: "She was taken by ambulance to the plane with her husband, a nurse and a paramedic."
On first pass I read this to mean her husband was a nurse and paramedic. (Which is why we shouldn't be dogmatic about using the Oxford comma.)
Sure, but adding a comma after “nurse” would only clarify that the husband wasn’t a paramedic, it would still be ambiguous as to whether he was a nurse. Like most sentences whose meaning is unclear without a serial comma, it would be better to recast this.
No, see, that’s exactly why we SHOULD be dogmatic! If everyone used the serial comma as the good lord intended, that sentence wouldn’t be ambiguous at all; there’d be no question the husband IS both nurse and paramedic.
(For the avoidance of doubt: I’m just being goofy; rewording is the way to go.)