So I'm usually careful, but got bit drunk and ended up downloading some naughty mp4 video files from direct download file upload site. And of course made copies and put them on external hard drive. Come next day and hangover, cursed myself, deleted all videos from Mac and external hard drive. Ran Malwarebytes, everything seems to be fine. What else should I do (besides not getting drunk again...)? The video files played all normally and were what I expected them to be. 1) Could I be infected? Will Malwarebytes find anything if there is anything to find? 2) Could my external drive and all my good normal files be infected? Could I infect other Mac systems with those files from external hard drive? 3) Could normally working mp4 video file contain something bad? 4) Could normally working mp4 video file leave something bad behind after I deleted it?