I had a friend who would mix those funny sayings together (without knowing!)
She'd say things like, "Not the sharpest knife on the Christmas tree"
She'd come out with things that would make you rattle your head for a moment and always make you laugh! Poor Dear! We never corrected her, it was delightful to just enjoy her as she was.
She once yelled at a gaggle of our children playing inside, "Be quiet! This isn't the ONLY house we're in!"
Stopped the kids in their tracks…. they just stood there, trying to figure that one out.
Once, at the beach, she turned to me and said, "Isn't it cool, the way the water comes right up to the shore?"
You just had to love her. I have copied her phrases, from time to time, when I am in a silly mood. It always brings back fond memories of my colorful, adorable friend!