People who start every third sentence with "To be honest..." or "To be perfectly honest..."   What, are you lying the rest of the time?

US Presidents (including the current one and his predecessor) who think that always pronouncing the article "a" as "ay" makes them sound authoritative. No, it just makes you sound condescending. Then they take it to the point where they can't us "an" properly, prior to a noun that begins with a vowel. That would lose them an opportunity to say "ay."

Grocery stores that start out with nice, broad, empty aisles that allow two carts to pass easily and which eventually become cluttered with marchandising displays to where barely one can get through. Memo to managers... the aisles are for PEOPLE not PRODUCT!