You could eat a bunch of carbs for a week, drink a bunch of water and wear a metal buttplug on Monday, go in for a weighin, then sit in the sauna, go in on Friday sans assplug and collect your money for 'losing' 3 kilos. Smile at the fats and say "man; that was so easy!" Though in the long run, they have the ability to lose a lot more; but at least it would provide a shitlording opportunity.