Get out of a dialog quicky. Get out of the OS popup (e.g. File save). Get out of the current context in your editor/IDE (e.g. Search etc) Cancel something. C

Get out of a dialog quicky. Get out of the OS popup (e.g. File save). Get out of the current context in your editor/IDE (e.g. Search etc) Cancel something. Cmd+esc takes you to the previous up from cmd+tab (instead of cmd+shift+tab). Ever wanted to cancel drag and drop?! Honestly the Esc key is indispensible.