They can't take that away from me

Mathematics is/are rubbish. Arithmetic is logical, but mathematics - no. This negative numbers bit, for example. I live in a rural village, and have done a course at agricultural college on Small Flock Management. I know a fair amount about sheep. I can drench them, I can dag them, I can trim their feet, I can inject them, I can deliver their lambs. All the sheep were positive (apart from the depressed ones, that is). One sheep, two sheep, three sheep - yep, no problem there. But we're told that if you add two negative numbers, you get a positive. What nonsense. But if I didn't have two sheep, and someone didn't give me two sheep, I wouldn't suddenly have four sheep gambolling around the garden, eating the vegetables and falling into the pond. Therefore the whole concept of negative numbers is patently absurd. QED.