Gorillas may seem strangely human in a lot of their behaviour, but their strength and ferocity is on another level. One Australian tourist learned this lesson the hard way during a 2011 tour of Rwanda. Johnny, perhaps feeling a little braver than he should have been, left his guide to get up close to a mother and her baby. Too close, as it turned out, and he earned a hefty shove in the chest for his trouble. Credit: YouTube/Johnny Clifton