Aboard the ship, he hears Vader telepathically telling him that it is his destiny to join the dark side. Source: Internet
Admiral Motti directly criticizes Vader for his touting of the force and its abilities, which results in the Dark Lord using force choke on the officer. Source: Internet
After Luke refuses to join Vader against the Emperor, Vader reveals that he is Luke's father. Source: Internet
An example of this occurs as Obi-Wan strikes down on Vader after applying an armlock in the duel's first half. Source: Internet
After a long and ferocious lightsaber duel, Obi-Wan defeats Vader by severing his legs and left arm; he then takes his former friend's lightsaber and returns to Padmé's ship, leaving Vader to die beside a molten lava river. Source: Internet
And I suppose, sometimes, people look at my demeanor and say, 'Well, he's the Darth Vader of the administration.' Source: Internet