for the heck of it

without any purpose except for fun

仅仅为了好玩，只是取乐而已

I drove my van across country just for the heck of it.

我开着小货车跨越全国，就是为了好玩而已。

The boys carried away Mrs Smith's front gate just for the heck of it.

男孩们把史密斯太太的前门卸走，纯粹是闹着玩的。