That's called "getting Spocked."
Next there is a little post from the F&*% Yeah Files where I sing the praises of the famous "Khaaaan!" scene in Star Trek II: The Wrath of Khan, one of the greatest moments in Film History.
According to a rumour I just made up, William Shatner is a hardcore method actor who really lives his roles. He prepared himself mentally for the emotional scene by meditating every night for a week on how much he hated beloved TV actor Tony Danza. When Shatner roars "Khaaan!" he's really summoning the focused totality of his Danza Hatred. Little trivia for you, there. It just makes the scene all the more powerful if you know that.