Wolowitz: Forgive me for being so bold, but I now see where Sheldon gets his smoldering good looks. Mary: Honey, that ain't gonna work, but you keep trying.
Sheldon: I can't believe he fired me. Leonard: Well, you did call him a "glorified high school science teacher whose last successful experiment was lighting his own farts." Sheldon: In my defense, I prefaced that with, "with all due respect."