for the hell of it
US /fɔr ðə hɛl əv ɪt/
UK /fɔr ðə hɛl əv ɪt/

1.
为了好玩, 只是为了取乐, 无缘无故
for no particular reason; just for fun or excitement
:
•
He decided to climb the mountain just for the hell of it.
他决定爬山只是为了好玩。
•
I bought an extra ticket for the hell of it, in case someone else wanted to come.
我多买了一张票,只是为了好玩,以防有人想来。