Leonard and Penny try to keep a secret on The Big Bang Theory. "The Stockholm Syndrome" is the 24th episode of the show's 12th season.

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The Big Bang Theory
The Big Bang Theory Season 12 Episode 24: "The Stockholm Syndrome"
Leonard Hofstadter, Penny
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The Big Bang Theory Season 12 Episode 24 Quotes

Sheldon: The only drug I need is the endorphins pumping through my brain in anticipation of our victory.
Amy: Well, technically, anticipation wouldn't be mediated by endorphins as much as dopamine but, y'know, you've been up all night so I'll give you that one.

Penny: Leonard? Coffee?
Leonard: Black and strong like Luke Cage.
Penny: I'm too tired to even be disturbed by that.