Shave with a really old shaver. Using a dull razor can help you lose weight in many ways:

• It will take longer to shave so you will burn more calories.
  
• It will be harder to shave so you will burn more calories.
  
• If the blade is rusty and you get a disease then you will probably lose weight.
  
• And my personal favorite (which I did today): do not pay much attention to how you are shaving. Your shaver may actually take a chunk out of your upper lip removing excess flesh and allowing heavy blood to leave the body.