Heh, reminds me of a story my driving instructor told.
He was on a truck parking lot with some pupils and they saw some clear, yellow and steaming fluid under their truck. He already guessed that that had to be cooling fluid, so he called his pupils so that they could tell him what it was. Cooling fluid tastes sweet, so that is how they went to determine what it was. The first pupil tasted it and said that it tasted salty, not sweet. The second pupil couldn't believe it and had to test it himself and he, too, concluded that it wasn't cooling fluid but something else, that tasted salty.
They looked for the third pupil to see if he had any idea what that fluid might be. The instructor refrained from tasting the fluid, because he had a leaking suspicion. At that moment the third pupil came from behind the truck and was just zipping his pants up.
From this day on the instructor wouldn't make his pupils identify an unknown fluid by tasting it.
Sorry for the lousy German