Rio again

Rio (doing homework): Would you say that "sheepish" was an antonym of "gregarious"?
(Marnanel laughs)
Rio: What?
Marnanel: Oh... um, sorry. I thought you were making a conscious pun.
Rio: Why?
Marnanel: Well, "gregarious" comes from a Latin word meaning a flock of sheep. But it is actually rather funny.
(Rio laughs)