Orcas have been ramming boats off the coast of Portugal, with over 50 recorded incidents. Scientists are unsure why this behavior is happening, as orcas are generally not known to harm humans. A boat captain shared a chilling experience where orcas rammed his boat for two hours, prompting the Coast Guard to advise him to shut off the engines and remain quiet. Despite these incidents, there are no documented cases of orca attacks causing injuries to people.