## Vim, 2 Keystrokes 

`vim -u NONE` then run the following (`-u NONE` turns off customization)

    i<up>

When vim is run in compatible mode the arrow keys are don't get interpreted properly. `<up>` gets interpreted `<esc>OA` which leave the following in insert mode. Which would leave (with a couple of trailing newlines)

    A

`i` starts insert mode.  
`<up>` exits insert mode, opens a line above and enters A into the buffer

Example of people encountering this in the wild. https://stackoverflow.com/questions/6987317/while-moving-the-cursor-across-a-vim-process-open-in-a-tmux-session-every-now-a/6988748#6988748