Bernadette: Watch what happens when you move.
Sheldon: Oh! Oh, boy, you weren't kidding. Oh, those are 10,000 lumens if they're a lumen.
Howard: Well, you know what they say: when life give you lumens, make lumen-Ade. [chuckles]
Sheldon: Was that a joke?
Sheldon: Based on the premise that "lumen" sounds like "lemon"?
Sheldon: [chuckles] That's hilarious.