Plot

Three friends decide to turn their fantasy vacation into reality after one of their friends gets engaged.

Three friends who were inseparable in childhood decide to go on a three-week-long bachelor road trip to Spain, in order to re-establish their bond and explore thrilling adventures, before one of them gets married. What will they learn of themselves and each other during the adventure?

Kabir (Abhay Deol) has just met Natasha (Kalki Koechlin). 6 Months later they are engaged. He wants to go on an extended bachelor party. A 3 week road trip with Imraan (Farhan Akhtar) and Arjun (Hrithik Roshan) - his two best friends since school. The only problem is Arjun is too tied up with work. After much emotional blackmail and cajoling, the boys set off on a journey with they were meant to take 4 years ago.

Natasha's friends warn her about the rowdiness on these "trips" & she is suspicious. The 3 meet up in Barcelona & straight away there is come left over tension between Arjun & Imraan. Imraan's real dad also lives in Barcelona & before coming he fought with his mother over his plans to meet him. She says that his step dad is his real father & Imraan should not try and meet Habib.

Arjun is a successful Investment banker & a bit of a douche bag. He throws his money around & keeps taking business calls on the trip. Imraan throws his mobile phone out of the car & Arjun has a fight with him. He even makes a snide comment on how the bag Arjun has bought for Natasha for 12,000 Euros is more than Imraan's salary. Apparently 4 yrs ago Arjun used to love a girl names Sonia & Imraan fell in love with her & she broke up with Arjun & then she dumped Imraan. Arjun has not forgiven Imraan for that, Kabir has signed them up for deep sea diving & Arjun doesn't know how to swim. Laila (Katrina) is their instructor & she pays special attention to Arjun. Arjun says that he will marry for money & even suggests that Kabir is marrying Natasha because his dad has a hotel business with a valuation of 1000 Crores.

One his first dive, Arjun love the magic underneath the water & finally lets go & learns to embrace life. He remembers how his recent girlfriend left him because he couldn't give time to her for work. Laila invites the bunch to the Tomatina festival where she is going next. Natasha finds out about Laila & is pissed at Kabir.

At the festival, Laila's friend Nooya joins them & Imraan is interested in her. Laila & Arjun connect. Natasha arrives at hotel & is super duper angry watching Kabir having fun with the girls. She joins the trip. Imraan has sex with Nooya. Laila & Nooya stay at Tomatina while the rest move on. Arjun & Laila say goodbye & nothing else. Laila follows him on Nooya's bike, kisses Arjun French style & says" she didn't want to have a regret" & rides back. Natasha tells Kabir that she is giving up her job for marriage & expects changes in priorities for Kabir as well. She says after marriage Kabir wont want to go on such boy trips. Natasha leaves for London. The boys carry on & Arjun asks Kabir if he is happy with Natasha.

Arjun arranges for a sky diving session for the 3 & Imraan is afraid of flying, but he loves it as well. They get into a brawl in a local pub & are jailed. Imraan tells the guys about Habib (Naseeruddin Shah) & places to call to him to come & post bail. Habib tells Imraan that his mum wanted to settle down while he wanted to become an artist & see the world. He was not ready for kids & thus he left. Imraan is pissed that Habib knew about Imraan for so long & never once tried to meet him. He leaves.

Kabir tells the guys that he bought a ring as a gift for his mom Bday & showed it to Natasha & she thought he is proposing & accepts in front of all his family. Arjun tells him to roll back his mistake. Imraan calls Laila & she joins the boys. Imraan has booked the "run of the bulls" adventure for the boys. Just before the run Imraan makes a "if I live pact" and says that he will publish his poems, Arjun says he will go to Morocco with Laila & live his life & Kabir says that he will break up with Natasha.

Arjun & Laila get married. Natasha attends the wedding with her hubby & she & Kabir are good friends. Imraan is with Nooya.