Sheldon Spying - The Big Bang Theory Season 12 Episode 23
On whom is Sheldon spying on The Bang Theory finale? "The Change Constant" is the 23rd episode of the show's 12th season.

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Photo Credit:
Michael Yarish/Warner Bros. Entertainment Inc./CBS
Show:
The Big Bang Theory
Episode:
The Big Bang Theory Season 12 Episode 23: "The Change Constant"
Character:
Sheldon Cooper
Related Photos:
TBBT Photos, The Big Bang Theory Season 12 Episode 23 Photos, Sheldon Cooper Photos
Location:
Los Angeles, California
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The Big Bang Theory Season 12 Episode 23 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.