If you have several open windows, and you grab one of them and wiggle it around (instead of slowly moving the window). All other windows will be minimized.
How is that "wiggling" feature actually called and how can I disable it?
To disable the Aero Shake gesture, use the Local Group Policy Editor (Win+R; gpedit.msc) to enable the group policy Turn off Aero Shake window minimizing mouse gesture.

It's located in User Configuration > Administrative Templates > Desktop.