You're never quite ready for a cow to appear out of nowhere. This driver in Russia clearly didn't expect to see any cows when he was cruising through the countryside, but perhaps he should have. The dashcam footage from his truck shows the vehicle colliding with a bovine at full speed, totaling the truck, but the cow just got up and walked away.
Then, don't let anyone fool you, hippos are always angry and very dangerous. One hippo, in particular, wanted to let families driving by on safari know that he was not pleased to see them. The hippo rammed one of the cars, forcing everyone to take the hint and drive off.