Where's Francis, the Talking Mule, When You Need Him?

My son and husband were discussing mules. The always-humorous nicknames "ass" and "jackass" found their way into the conversation.

I offered my opinion that "ass" and "jackass" refer to a donkey, not to a mule, and mentioned that a mule is the offspring of a donkey and a horse.

Son David (alias) asked, "So, if a boy mule is a jackass, what do you call a girl mule?"

I replied, "'Ma'am.'"

Son David (alias) threw a pillow into my face. Repeatedly.