Index: src/event/event.js
===================================================================
--- src/event/event.js	(revision 1957)
+++ src/event/event.js	(working copy)
@@ -298,7 +298,7 @@
 	 * @cat Events
 	 */
 	bind: function( type, data, fn ) {
-		return this.each(function(){
+		return type == "unload" ? this.one(type, data, fn) : this.each(function(){
 			jQuery.event.add( this, type, fn || data, fn && data );
 		});
 	},