Add Rotate Everything By 13 Letters as a vim til

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_456 TILs and counting..._
+_457 TILs and counting..._
 
 ---
 
@@ -512,6 +512,7 @@ _456 TILs and counting..._
 - [Replace A Character](vim/replace-a-character.md)
 - [Reset Target tslime Pane](vim/reset-target-tslime-pane.md)
 - [Reverse A Group Of Lines](vim/reverse-a-group-of-lines.md)
+- [Rotate Everything By 13 Letters](vim/rotate-everything-by-13-letters.md)
 - [Running Bundle With vim-bundler](vim/running-bundle-with-vim-bundler.md)
 - [Scrolling Relative to the Cursor](vim/scrolling-relative-to-the-cursor.md)
 - [Searching For Hex Digits](vim/searching-for-hex-digits.md)

vim/rotate-everything-by-13-letters.md

@@ -0,0 +1,25 @@
+# Rotate Everything By 13 Letters
+
+For some inane reason, Vim comes with a
+[ROT-13](https://en.wikipedia.org/wiki/ROT13) feature. So, if you are ever
+in need of rotating the letters of some portion of the file by 13, you can
+do that with the simple `g?` binding.
+
+For example, if you hit `g??` on the following line:
+
+```
+Six dollar eggs
+```
+
+you will get
+
+```
+Fvk qbyyne rttf
+```
+
+As you can see, casing is preserved.
+
+The only practical uses of this are Vimgolf and convincing people at coffee
+shops that you are a hacker.
+
+See `:h g?` for more details.