just for the heck of it

Then Jack kicked the dragon too, just for the heck of it.

"People don't pick up and leave their homes just for the heck of it," Janet Napolitano, head of homeland security during the Obama administration, told the BBC.

“I wouldn’t recommend anyone starting kratom just for the heck of it.”

No stepping out just for the heck of it.

Sit-down Mario Cart games are there to hop on just for the heck of it, and there’s an old-fashioned arcade around the corner.