Charlie's first words this morning were "I cold."

When I give the birds baths, I always offer to let them stand on a perch in front of their personal fan heater, something like this, to dry. I ask, "Are you cold?" then extend my hand for the bird to step up.

Charlie has picked up the word without a notion of what it means.

How do you teach a bird the concept of cold? Without resorting to the old parrot joke?