Read this post about an introduction to the Rasas.
While it is a well known and accepted fact that Duryodhana was envious and jealous of his Pandava cousins, their exploits, their popularity and their general good fortune in life, there were a couple of reasons that he harbored a special deep rooted hatred and anger towards Draupadi, the wife of the Pandava brothers.
Once when Yudhishtira performed the Rajasooya yagna to proclaim himself the lord of all kings, he invited his Kaurava cousins to witness the yagna. Although Duryodhana had no real interest in the yagna itself, he wanted to see Indraprastha, the swanking new capital city of the Pandavas which had been built by the legendary architect of the Asuras, Maya himself. He had heard so much about the wonderous city and its various attractions that he wanted to experience it for himself.
Once he was there he was completely spell bound by the various illusions that Maya had created in the city. In fact Maya had built in so many illusions in the palace that he ended up being completely befuddled by them. When he was walking in the palace, he came across a room with an extremely shiny floor. Mistaking it for a pool of water, he drew up his clothes to ensure that they didn’t get wet, but it turned out to be solid marble and he felt extremely foolish at his actions.
Another time, he mistook an actual pool of water for solid marble, based on his earlier experience and ended up falling into the pool with all his clothes on. These incidents drew peals of laughter from his arch-nemesis Bheema and his wife Draupadi, who laughed the loudest.
As if this were not enough, Duryodhana walked into a wall which looked like a real door and hurt his head. More than his head, his ego was well and truly hurt when Draupadi supposedly commented “Trust the son of a blind man to be blind himself!”
Draupadi’s laughter, her hasya, angered Duryodhana so much that he resolved to destroy the Pandavas and take away everything they ever owned. And thus the seeds of conflict were sown in his mind.
Image courtesy ; kidsgen.com