I took a grammar usage class in my former life as a college student. The class was fun, but I didn't do too well. But that's a different story.
Every once in a while, we'd delve into improper grammar usages. Phrases like "At the end of the day..." and the subject line were forbidden in this class.
I hear people on the news using "whatnot" and it still makes me cringe.

Ran"I do admit to saying 'y'all'. Its a Southern thing"dy