I had a hard time coming up with an O post. I went with quotes, a couple of them are naughty but taken in context, hopefully they are good to go, ha!
"When a man gives his opinion he’s a man. When a woman gives her opinion, she’s a bitch" by Bette Davis
"You’re entitled to your negative opinions but talk slowly; I only have two middle fingers to go around" by Rachel Wolchin
This one was too good to pass up.
"I have opinions of my own -- strong opinions -- but I don't always agree with them" by George W. Bush