Want to isolate a currently open window and have everything else minimise without having to minimise all windows individually?

Grab the window you want to isolate as if you are going to move it and… shake it (like a Polaroid picture).

To un-minimise your other windows… shake it again.

Source: Me getting frustrated when a window wasn’t performing (Shaking it didn’t fix the performance problem).

Please note: that apparently you shouldn’t actually shake polaroids.