Was it Easier?

Today I saw an interesting video. I had no idea that so many people believe that they could beat a lion in a fight. in an anime I have seen a man boxing against the bear. But it was an anime and he was a pro boxer. So I wonder what makes those people believe that they could beat a lion. I would not like my chances against a german shepherd or a similar size dog. A wolf would definitely destroy me. Also it is interesting that not everyone believes that they could beat a rat.