maybe not exactly what you were thinking:

  o  hair cut
  o  fasting
  o  amputation (It will messed up BMI-calculations)
  o  going to the toilet
  o  undressing
  o  going off-world and g < 9.98
  o  donate blood
  o  get the common flu (not recommended) 
  o  drugs
  o  start smoking

on a more serious note, weight loss is about those small victories. one step at a time. gram for gram. there is no quick way to make weight loss.

  o  avoid stress
  o  make sure you get enough sleep
  o  exercise/activity
  o  muscles are heavy, if you start exercising, don't worry if you gain
  o  reduce intake of of calories, but must match you level of activity