Most destructive "forgot-to-enter-insert-mode" sequence in Vim Pretend you have an arbitrary text file (which you may choose).

Give the sequence of keystrokes that is most destructive (*) if it was intended to be inserted to the text, but instead was entered in normal mode (i.e. i/a was not pressed). You may not enter visual mode and not quit Vim.

Destructive is defined as follows: The ratio of changed/deleted characters by the number of necessary keystrokes.
You get bonus points if your changes cannot be undone by a fixed number of undos.



Example: Input file without line breaks. Input sequence: dfs.
: 0,0 w 
:r


ruins everything no undo