diff --git a/examples/unrandomize.coffee b/examples/unrandomize.coffee
new file mode 100644
index 00000000..877035c1
--- /dev/null
+++ b/examples/unrandomize.coffee
@@ -0,0 +1,18 @@
+# Modify global object at the page initialization.
+# In this example, effectively Math.random() always returns 0.42.
+
+page = new WebPage()
+page.onInitialized = ->
+  page.evaluate ->
+    Math.random = ->
+      42 / 100
+
+page.open "http://ariya.github.com/js/random/", (status) ->
+  if status != "success"
+    console.log "Network error."
+  else
+    console.log page.evaluate(->
+      document.getElementById("numbers").textContent
+    )
+  phantom.exit()
+