Strange bug and crash on macbook pro retina

Goodmorning to everyone,

today i opened my mac, started writing some script, went away for a couple of minutes and here we go. The touchpad and the keyboard still were working, and i could type and move things. Before shut it down i tryed to close and open it, or closing application etc.. but it only got worst. Then i shut it down, and now it seems to work fine, but what was that?