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.