You cut your hair based on weight savings instead of style.
You needlessly drill holes in things you own to "save" weight.
You buy swiss cheese instead of cheddar because it saves you time of putting holes into it.
Remove a kidney, then take it step further, remove appendix, tonsils, wisdom teeth, toe nails, and wax your entire body.
Although you may be able to save some insulation weight if you keep all your body hair.
You analyze all the food you buy based on calories/gram.
You buy your children the lightest toys to promote the UL mindset from an early age. (Bonus points for multi-use toys)