A couple cross country skiing in Gaspesia, Quebec got a surprise when they came upon a trapped moose. It decided to charge past them, dangerously close.
Moose are not normally aggressive; however, they can be very aggressive in winter when they are hungry; tired of walking in deep snow; or harassed by people, dogs, and traffic.
This moose looked more scared than anything. But if you want to see a real fright, check out this hippo chasing down an African safari boat.