Get that? 500 Pounds, 2000 McDonalds Quarter Pounders, 65 gallons of water. There are many ways you can mentally view 500 pounds. Truth be told we are 60% to 80% water. Now if you buy the later estimate then I am 50 gallons of water. Each gallon of water is 8 pounds X 50 equals 400 pounds. That is 80% of 500 pounds,