Today I heard an ill person being described as, "weak as a kitten." Not an unusual phrase, and one that is generally accepted and well understood. But the little voice that lives inside my head declared, I bet if I dunked the kitten in water and set it on your head you would re-evaluate that statement.
Usually humorous, frequently irreverent, occasionally controversial, rarely important. Best served with a pinch of humor and a dash of skepticism. Stirred, not shaken. Hold the ice.