adv. phr. Merely as a matter of amusement. "I'll bring a goat to class," Bob said to his classmates, "just for the fun of it; I want to see what kind of a face Professor Brown will make."
JUST FOR THE FUN OF IT
Meaning of JUST FOR THE FUN OF IT in English
American idioms English vocabulary. Английский словарь американских идиом. 2012