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But most of them stink.
EDIT: Hm...it's probably best to explain this, since it sounds jerk-ish OOC. When I was introduced to this saying, it was always said "Opinions are like arseholes, everyone has one and most of them stink". Heck, I didn't even know there was a different version until a few years ago. So, naturally, I feel as if something's missing when people don't say the last part. Granted, the meaning changes when you add it in, but it's hard to resist.