I get confused when the wrong method of measurement is used to quantify something, as in, "The human body is X liters."  Generally you expect measurements concerning the human body to be in weight or height, not volume.  The volume of a solid is hard to visualize, as is the weight of a liquid.  Such is the case with this news report about an overturned beer truck:  "Police say a truck carrying 40,000 pounds of beer overturned in Vermont and closed a highway for several hours."  How much is 40,000 lbs of beer?  I have no way of comparing that to something I know.  I understand a pint.  I understand fluid ounces.  But pounds?  I'm assuming either the police or the reporter simply read the number on the side of the truck that referred to how much weight it was carrying.  It could've been 40,000 lbs of metal or 40,000 lbs of water.  Either way, the truck couldn't carry more than 40,000 lbs of anything.  And yes, I realize that, knowing the density of beer is something close to water (~1 g/cm3), I can calculate that the volume of 40,000 lbs of beer is somewhere around 4800 gallons.  But I wouldn't have to do that calculation if, like every other liquid on earth, this beer was measured in volume. 

It's the same with ketchup.  A bottle of ketchup lists its weight in ounces, which again is odd because I would consider ketchup a liquid, not a solid.  And yes, that's ounces of weight, not fluid ounces, which further points out the ridiculousness of English units. #science