4E Critical Fumbles

4E doesn't have a fumble system, something we found unacceptable!  After some tinkering, we came up with a simple, effective system.

If you roll a natural 1 on an attack roll, make a saving throw.  If you pass, your attack simply missed.  If you fail, you fumbled!

Then various things happen, most commonly one of the following (though obviously circumstances dictate different things)

• You drop your weapon / implement
  
• You provoke an attack from an enemy in melee with you
• You hurt yourself and take a -2 penalty on all rolls until the end of your next turn
• You fall prone

As a group, we love fumbles as they are always hilarious to picture the powerful warrior falling on his ass or the evil demilich tripping over his robes and falling down the stairs, or what have you.