Teacher: "How many Jaguars do we need on the robot?"
Student: "4."
Me: I think for a second, but only recall 3 needed Jaguars. "Where are you getting 4 from?"
Student: "Two for the base, and one for the arm."
Teacher and I:

"Umm... that's only 3."
Student: "No it's not, I said two for the base and one for the arm."
Teacher and I: *Laughs*