What is the main similarity between "The Purple Cow" and Frost's poem "Mending Wall"?

The main similarity between both poems; the purple cow by Gellett Burgess and the mending wall of Robert Frost is their humorous language.

The American Poet Robert Frost explores the theme of humor in his poem "The Mending Wall". Just like the line, "Spring is the mischief in me, and I wonder if I could put a notion on his head."