Sheldon: You know, I try very hard to make our lunch hours educational and informative, but your insistence on talking about your own lives stymies me at every turn.
Leonard: Fine, Sheldon, tell us about your giant rodents.
Sheldon: No, you squandered your time with me, and the moment has now passed. Feast on your disappointment, much as the capybara feasts on its own waste.