Plot

Sameer is a young toddler when a Pandit predicts that he would have a bad temper all his life. At school, Arun is Sameer's only friend and the only person who can help him cool down.

Sameer (Salman Khan) is a hot-tempered person with terrible anger management issues ever since his parents passed away in his childhood. After he beats up a group of goons who tried to assault his girlfriend Roma (Amrita Arora), she breaks up with him due to his bad temper.

Thus, as per his horoscope, he is very unlucky in love. With a broken and heavy heart and to get away from everything, he leaves for Goa to take up a job as a lifeguard.

On the train, Sameer's co-passenger Suraj (Satish Shah) makes him think that he is a thief by asking him where he keeps important things (like money) in his luggage. Sameer stays awake all night to avoid being robbed, while Suraj sleeps after conning Sameer into guarding his luggage. Suraj admits this to Sameer the next morning at the station. Sameer learns that Suraj is a security guard at his resort and puts him on night guard duty for three months. This puts a crimp in Suraj's marriage, and, although he apologizes, Sameer is adamant.

In Goa, Sameer meets Rani (Priyanka Chopra) an up-and-coming fashion designer and instantly falls in love with her. After many attempts at befriending her and a rough start with her father Colonel Jugraj Singh (Amrish Puri), Rani and Sameer become friends. However, Sameer's ill-fated luck comes into play as he still has some rough incidents with her father and Rani, too gets angry with him since she overhears him saying bad things about her to Pandit Ji (Rajpal Yadav).

Further trouble arrives in the form of Sunny (Akshay Kumar), who moves into the same house as Sameer and shares a room with him. He too meets Rani, falls in love with her and decides to cause further trouble by getting closer to her through the mistakes Sameer makes. This causes a lot of trouble between the two. It is evident that Sunny is out to ruin Sameer's relationship with Rani so that he can steal Rani away from him.

Sunny takes credit for Sameer as the latter had helped Rani with money for a fashion show and had made the mistake of remaining anonymous and calling himself her "well-wisher". Rani wins the competition and wants to thank her "well-wisher" in person. Sameer, who gave Rani the money he had saved for his grandmother's eye surgery and his sister's wedding, goes to meet her, but Sunny gets there first, claims to be the well-wisher, and takes her away. Sameer follows on his motorcycle and accidentally injures Singh.

Also, Sunny goes to the extent of taking credit for a painting of Rani that Sameer has made. He kidnaps Rani's dog, Tommy and blames Sameer for it. Sameer buys an identical dog and tells Singh that he has found Tommy. He is exposed when the dog bites Singh and runs away after he gives it a cold bath.

Although Sameer is angry, he reconciles with Rani with the help of a magician at a New Year's Eve party. Sunny places a bar dancer in Sameer's room one morning; Rani, who went there to invite him for breakfast, sees the dancer sleeping there and assumes that they had sex. She is also horrified that Sameer is now the leader of the Eagle Gang, a group of bikers who roam the streets of Goa and cause trouble. These actions aggravate Sameer and ignite his temper, making his relationships rocky. Sameer makes another attempt to apologize. When he goes to Rani's house, he is surprised to see Suraj. Suraj is Rani's uncle, who now knows that he loves her. Sameer apologizes and takes Suraj off night duty.

Also, a misunderstanding occurs when Sameer's grandmother Pushpa (Shashikala) who is partially blind arrives and mistakes Rani's mother for Rani while trying to persuade her into marrying Sameer. Sameer, who goes to sort out the situation gets caught in an embarrassing position with Rani's mother Rama (Supriya Karnik). Rani, who is shocked and disgusted is later advised by her mother that Sameer had not been at fault in that situation. She also says that Rani should carefully deliberate on whom she loves more- Sameer or Sunny.

Disgusted and completely out of hope and patience, Sameer decides to leave Goa forever. As he is leaving, Sunny arrives and taunts him on how he got close to Rani through the latter's mistakes. Sameer says that he has had enough of dreaming of Rani and wishes Sunny all happiness as he leaves. Sunny however tries to have the last laugh as he taunts Sameer again. This time, Sameer loses his temper completely. He rounds on Sunny and chases him through the streets right through to a crowd at a cricket stadium, where India and Pakistan are supposed to be playing a friendly match.

Deciding to have one last try, he enters the field after breaking through security, takes the mike from Kapil Dev, the guest of honor, and uses it to apologize to Rani and her parents very sincerely for his past mistakes. Saying so, he confesses his love for her and asks her to marry him in front of the whole crowd, coupled with motivation from spectators and players alike. Rani runs out to the field and embraces him, thus reuniting with him.

At the end, Sunny arrives and reveals that he is actually Arun, Sameer's childhood friend who had come to Goa, for a cure to Sameer's anger management issues. He had gone to visit Sameer the first thing after coming back from America after 19 years and had met the latter's grandmother, who had told him about Sameer's heartbreak and subsequent departure for Goa. At that point, he had decided to help Sameer, but by posing as his enemy. He had revealed the same to Rani and her parents earlier. Sameer is then reunited with his old friend as well. The film ends with Arun conducting Sameer and Rani's marriage.