"That's my darling Luke. He grins like a baby but bites like a gator" So something along the lines of " Darling Luke, Bites like a gator"
Also "Cool Hand Luke. Hell, he's a natural-born world-shaker" So "Luke, World-shaker" or "Natural born world shaker"
And "What we got here is... failure to communicate. " Which I just think if a cool quote, not sure it would make a good tag unless he was deaf.
THIS is sorta perfect... "Ya know, sometimes I wished people was like dogs, Luke. "
More... "Oh Luke, you wild, beautiful thing. You crazy handful of nothin'." So "Crazy, Wild Beautiful, Luke"
Ok done now!