Golden retrievers can be dangerous! One we had when I was growing up, knocked my father down and broke his ankle. Steve Doocy on Fox and Friends said that his golden knocked down his wife and she broke her kneecap. :) Ours scrapes his nails against us when we're swimming in the pool....
A cat can do that too. Turns on its gravity beam (the same one that enables a 10 pound cat to weigh 100 pounds on your bed) then gets right in front of your foot. Then when you trip on it, it runs right in front of your other foot.