Can you top this?

Rona and I were being competitive in the bus to San Geminiano. I said I knew something she didn't know: that all the productions this year at Arena di Verona were by Zeffirelli. She didn't know.

But then she topped me. "Did you know all female opera singers take estrogen to keep their mucous membranes moist?". All seems like a bit of an exaggeration, but she's right. I didn't know that.