Scariest creature on land

I was in a debate with someone at school, and he was talking about how a bear is by far the scariest creature on land. I strongly opposed this. First of all, I don't see bears as scary at all. You want to give them their distance, but they're not scary. When the person asked me what the scariest creature on land was, I answered without a doubt, "Us."

I truly believe that we are the scariest. The boy said I was 'just being cynical', and while that may be true, I continued to make my point. I said, "Well, what if we put the bears in our shoes, and them in ours. All we know is that we are pushed out of our homes by these critters, and then they demolish it. The put in big, noisy and smelly things. Our food is gone, and every now and again, they kill one of us and mount the head on the wall as a trophy. If we kill one of them when they come to our home, that one of us is hunted and killed. I would be pretty dang scared."

Anyway, if you're reading this, I want to know. What do you think the scariest creature is and why?