How about, "I care so little that I can't even be bothered to properly pronounce that I couldn't care less." or "I could care less" is actually sarcasm which

How about, "I care so little that I can't even be bothered to properly pronounce that I couldn't care less." or "I could care less" is actually sarcasm which implicates that caring is obviously unlikely. Both statements display a stronger degree of uncaring than "I couldn't care less" which is actually a pretty boring and to the point statement. Therefore I find "I could care less" to be the clear winner to indicate how little I actually care. In summary, "I could care less".