in the lab...

L: Excuse me, is the line of the graph supposed to be straight or curved?
Demonstrator: Well, you're drawing a calibration CURVE. What do YOU think?
L: So, it's a curve then? (ready to walk off...)
Demonstrator: No, the graph should be a straight line.

*moment of silence* o.O

L: So, the graph's gonna have a straight line?
Demonstrator: Yes
L: So, it's a calibration CURVE with a straight line...
Demonstrator: *pause* Yes. (with an air of confidence)
L: ... *shrug* 'mkay...