A man finds himself seated next to a priest during a long plane trip.

They get to talking. He asks the priest what order he is in. “I’m a Dominican.”
Oh, the man replies. “I went to a school where we were taught by Jesuit priests. What’s the difference between the Jesuit and Dominican Orders? ”
“Well, they were both founded by Spaniards — St. Dominic for the Dominicans, and St. Ignatius of Loyola for the Jesuits.
And in their early years, a main purpose of both orders was to combat heresy — the Dominicans to fight Catharism, and the Jesuits to fight Protestantism.”
The man next asks. “Are there any other differences between the Jesuits and Dominicans?”
The priest growing tired of the conversation says, “Met any Cathars lately?”