The Mentalist, Season 1

Jane:
It's funny what bad liars cops are. I guess they're not used to concealing themselves under questioning.

Lisbon:
I'm a cop and I lie to you all the time, you never catch it.

Jane:
I'm sorry to burst your bubble, but you're translucent, my dear. I always know when you're lying. Sometimes I let you think you've fooled me just so you don't feel bad.

Lisbon:
Name one time.

Jane:
Last thanksgiving you said you were going back East to your brother's house, but I knew you actually planned to have three days at home alone to watch old movies and eat ice cream.

Lisbon:
Okay, so that's one time.