Once, after defeating Kubera, his step-brother, King Ravana was returning from Alakapuri to Lanka in a Pushpaka Vimana. On the way, he had to cross Mount Kailash where Lord Shiva and Parvati devi were enjoying their private moments. To his surprise, Ravana found that he couldn't cross the mount, and Nandi, Shiva's attendant, politely asked Ravana to change course.
Infuriated, Ravana decided to uproot the Kailash mountain. As he proceeded to lift it, Kailash began to shake, and a terrified Parvati embraced Shiva. However, the omniscient Shiva realized that Ravana was behind the menace and pressed the mountain into place with his big toe, trapping Ravana beneath it. Ravana gave a loud cry in pain. Since Ravana cried, he was given the name "Ravana" – one who cried. (parimaLa migavuLa)