The Big Bang Theory: 15 Insane Details You Definitely Missed
10. Sheldon Claims That Not Eating In His Apartment Is As Crazy As Not Using The Letter M, Then Uses It
In the season four episode "The Toast Derivation", Leonard and Howard decide to have dinner at Raj's apartment one night, owing to Priya - at the time Leonard's girlfriend - living with her brother. Sheldon, disturbed at the sudden change to the norm, states that the entire situation is "madness".
Or, rather, "adness".
To him, eating elsewhere was as crazy as not using the letter M, which causes his sentence to become "This is adness. This is utter and complete adness". Notice the mistake? Sheldon forgot about the M in complete.
In retrospect, this was perhaps an intentional move from the writers and if not, they probably saw how much of a reaction it got from the studio audience and kept the quote-unquote mistake in the final televised edit.