diff --git a/bot/plugins/useless.py b/bot/plugins/useless.py
index 0827889..b0d6e11 100644
--- a/bot/plugins/useless.py
+++ b/bot/plugins/useless.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 import random
+import re
 
 import irc3
 from docopt import Dict as DocOptDict
@@ -324,6 +325,16 @@ class Useless(DatabasePlugin):
         """
         return ' '.join([self._rainbow(i, word) for i, word in enumerate(args['<words>'])])
 
+    @command
+    def halfwidth(self, mask: IrcString, target: IrcString, args: DocOptDict):
+        """Turns UPPERCASE words into halfwidth characters
+
+        %%halfwidth <text>
+        """
+        def halfwidth_replace(match):
+            return "".join(chr(0xFF20+(ord(c)-64)) for c in match.group(0))
+        return "[HALFWIDTH] {}".format(re.sub(r'(?:\b)[A-Z]+(?:\b)', halfwidth_replace, args.get('<word>')))
+
     @command
     def asshole(self, mask: IrcString, target: IrcString, args: DocOptDict):
         """Checks how much of an asshole you are.