The Big Bang Theory2007

Sheldon Cooper:
I think you're overestimating the tensile strength of the substructure you're building.

Howard Wolowitz:
Sheldon, I know what I'm doing.

Sheldon Cooper:
If you knew what you were doing, there wouldn't be a space toilet where my coffee table should be.

Rajesh Koothrappali:
Howard, wait. Why don't you use this instead of the PVC to keep the transverse filter assembly in place?

Howard Wolowitz:
Because this is not a spare part from the space station. This is the thing from the pizza box that keeps the lid from touching the cheese.

Rajesh Koothrappali:
Is that what that's for? In India, the lid just touches the cheese.

[turning to Sheldon]

Rajesh Koothrappali:
Of course, we also have rampant poverty and periodic outbreaks of cholera, so a little cardboard in our cheese is no biggie.