Public service announcement

Note: usually, what you want to say is "I could NOT care less". If you say "I could care less", this lacks the impact you desire, unless you state specifically to what degree your level of caring could decrease from its current value.

For example: "I could care less, possibly, but the amount would be measurable only on the Planck scal...e." That works handily, and has the advantage of also being amusing.

This has been a PSA from the Youth Outreach Undertaken to Improve Delivery of Insulting and Obnoxious Tropes (YOUIDIOT).