Which popular, though grammatically or logically incorrect, variants do you often hear in everyday conversations?

Like "he had another thing coming" and "I could care less", for example.

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FreddieUK · 70-79, M

The modern form 'would of' instead of 'would have' or 'would've'. Apparently this nonsense has become acceptable in 'respectable' writing. If it's used in anything I read, the writing is not respectable.