When my kids were small I used to call them "punkin". Now they're married with their own kids. Once in a while I'll slip and call one of my daughters 'punkin' again in front of their kids and they (the kids) just laugh and laugh.
"Did you write Punkin on your papers at school, Mom?"
"Punkin, can I go outside?"
"Punkin, will you pick me up after school".
One of my 5yr old grandsons really latches on to it and won't stop calling his mother "Punkin" for days.
My DDs just love me more when it happens...lol.