Way to often the player is not in focus (mostly after alt tabbing) and space bar scrolls me one page down. Now I have to scroll up again and klick into the picture. Infuriates me just thinking about it.
Because I use j and L for back and forwards 10 seconds, so I might as well use k for pause and resume given its in the middle. Also often space will just scroll down the page, like how up and down arrows sometimes do volume and sometimes scroll.