diff --git a/javascripts/theme.js b/javascripts/theme.js
index ff83fe5..03548b3 100644
--- a/javascripts/theme.js
+++ b/javascripts/theme.js
@@ -107,6 +107,19 @@ function alter_new_issue_page() {
         return false;
     }
   });
+  $('input#issue_subject').on('change', function(evt) {
+    var val = $(this).val();
+    var uppercases = val.match(/[A-Z]/g).length;
+    var all_letters = val.match(/[^\s+]/g).length;
+    var ratio = uppercases / all_letters;
+    if (ratio > 0.6) {  // more than 60% of uppercase letters
+      // change to lower case
+      $(this).val(val.toLowerCase());
+      // and disable high priority values
+      $('#issue_priority_id option + option + option').attr('disabled', true);
+    }
+    return true;
+  });
 }
 
 $(function() {