Sure. There was a time when a canoe capsized in a remote Amazonian river. The people in the canoe found themselves in the water with a large school of piranhas. The piranhas were extremely aggressive. They began to bite the people immediately. The victims were helpless as the piranhas ripped chunks of their skin and muscle. It was a terrifying ordeal, and not all of them survived.
One scary story involves a group of explorers. They were crossing a shallow part of an Amazon river. They underestimated the danger of the piranhas. As they walked through the water, the piranhas attacked. They targeted the legs first. The explorers panicked and tried to run through the water, which only made the situation worse as more piranhas joined in. The water turned red with blood, and they were lucky to make it out alive with some very nasty wounds.