[Yardstick]

I’m with you on the apostrophe but think you’re out to lunch on the could/couldn’t care less thing.

[Cyber Liberty]

"I could care less" means it is possible to care less than I do. Grammatically, that equals "I care."

"I couldn't care less" means it is not possible to care less than I do. That equals "I don't care."

So which is the one you wish convey? Do you care or don't you? It matters. Now I'm off to lunch, thank you for the idea. Now speak straight. :^)