premise: Three snake charmers stand in the road while one pulls a snake out of a box, and another large snake rears its head back in the fore-ground. hypothesis: three snake charmers sit in the road while they put their snakes back in boxes.
contradiction: In 1 snakes are being pulled out of a box, in 2 the snakes are being put back in the boxes.  The action is different in both sentences and the number of boxes is different.