Wow you're... right!
This one guy played bass tuba, and every time someone saw him lugging it up and down stairs they all said the same thing. "I bet you wish you played the piccolo." (Or flute, or some other small instrument.) And nobody ever stopped to think that everybody else had said the same thing. From him I learned to stop and think about the kind of thing people would always say in a situation, and then try to not say it.
Speaking of obvious things... If I had a nickel for every time somebody I know has named a black cat "Midnight" or a white cat "Snowball" I would use all that money to move to a place where they are more creative. Our pets have always had real names - Carlyle, Maxwell, Tiger Lily (that was my sister's doing) Hugo, Sam, Dan...