You catch your boss banging his secretary...

...in the restroom after a co-worker lunch at the local bistro. He has been micro-managing everyone in your office for the last three years, and you have been very patient with him, but you know his wife personally and can no longer hold back.

You so badly want to say:

Excuse me Dick. I'm sorry for interrupting your...eh, whatever this is, but your wife and I were talking last week about her lab results. I'm so sorry to hear that she has been diagnosed with the herp. Anyway, have a good afternoon.