Have you ever noticed, when you approach nervous sheep they always act in one of the following ways;

1. Lambs near their mothers will immediately run to them and start suckling, regardless of if they happen to be in the middle of an A road
2. older ewes will fix you with a steely glare, stand their ground, and then urinate in a very deliberate manner
3. or panic and run away, and if in an enclosed space, run head first into a fence/wall/gate with hilarious results (always cheers me up)