diff --git a/app/controllers/rewards_controller.rb b/app/controllers/rewards_controller.rb
index e73ec876f6..1159aa194d 100644
--- a/app/controllers/rewards_controller.rb
+++ b/app/controllers/rewards_controller.rb
@@ -65,8 +65,12 @@ class RewardsController < ApplicationController
   
   def buy
     @reward = current_user.rewards.find(params[:id])
-    current_user.money -= @reward.value
-    current_user.save
+    @too_expensive = true
+    if current_user.money > @reward.value
+      current_user.money -= @reward.value
+      current_user.save
+      @too_expensive = false
+    end
         
     respond_to do |format|
       # format.html { render action: "edit" }
diff --git a/app/views/rewards/buy.js.erb b/app/views/rewards/buy.js.erb
index 6f4dd4b7cf..b0d8ed9858 100644
--- a/app/views/rewards/buy.js.erb
+++ b/app/views/rewards/buy.js.erb
@@ -1 +1,5 @@
-$('#money').replaceWith("<%= escape_javascript(render 'shared/money') %>");
+<% if @too_expensive %>
+  $('#money').effect("pulsate", 100);
+<% else %>
+  $('#money').replaceWith("<%= escape_javascript(render 'shared/money') %>");
+<% end %>