Grammar pet peeves: Affect vs Effect.
This pair can be confusing because each word can be used as a verb or as a noun. Perhaps these definitons can help clarify.
Affect - verb: Causing a change in something. e.g.
"Trump passing gas affects the comfort of everyone in the courtroom."
Affect - noun: The way someone displays themselves. e.g.
"Trump's affect is one of ignorance, of not knowing he is passing gas in the courtroom."
Effect - verb: Making or causing something to happen. e.g.
"A truly noxious gas may effect a total evacuation of the courtroom."
Effect - noun: The result of some action. e.g.
"The effect of the noxious gas was that most people covered their nose and mouth."
(Wow, seems like a lot of people enjoyed this! Thanks for the interest and sharing all your other pet peeves.)