by Rupal, the Grammar Nazi
Using any form of the word "comprise" to mean anything other than its true meaning, which is "include."
Pronouncing the "t" in "often."
Using i.e. instead of e.g., or e.g. instead of i.e.
Saying "I feel badly" when you actually feel "bad."
Saying something like . . . "The work was done by Joey and myself." (2 pet peeves here)