At my company, we have to say "borrower" quite often. It's fine once, but by the third time, it starts sounding like "barr-rr."
My personal one is "jewelry." I don't say joo-ell-ry, but jool-ry. People make fun of me.
Regionally, when people say "drawer" as "draw" or "tour" as "tur" it just makes me cringe. But not as much as hearing our nation's capital referred to as "Warshington."