“Patios full”….Facebook status by a restaurant. If they have more than one patio, this works. Otherwise, not. I don’t think they do.
Self-explanatory:
This may not qualify fully as grammar, but I often hear people say in response to someone, “Yeah, no” or “No, yeah.” How do those two work together? Do you agree with someone? Then, “yeah”, “yes”, “right” or something similar would be correct. If you disagree, the “no’s” have it.
Also self-explanatory:

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Sarah Leavitt-The Authoritative Field Guide to Language Vermin
There are a number of things I wouldn’t call oxymorons, rather, in the spirit of the Grammar nazi posts, I would call “nazimorons.” In fact, “Yeah, no” (or the opposite), would probably qualify as a nazimoron, don’t you think? Seen any good nazimorons lately? Keep an eye open; they’re/there/their everywhere!