In "Damned if You Do" Jo is interrogating a young man accused of beating his father to death and his mother to near-death. He claims that he was at a frat party but doesn't have an alibi for the timeframe in which his parents were attacked. Jo proceeds to calculate down to the minute how much time it would have taken him to leave the party, attack his parents, change and return to the party without anyone else there being the wiser.
Suspect: What are you doing?
Jo: Math. Because you're not man enough to admit what you did, now I've gotta do math. I hate math.