Jai(Sidharth) and Diya(Katrina) are childhood friends who are in love with each other. Jai is a Mathematics professor in Delhi and Diya is an artist. When Diya proposes marriage to a commitment-phobic Jai who wants to move to Cambridge and teach there, the discussion somehow reaches Diyas father(Ram Kapoor).
The night before their wedding, Diya and Jai have a fight and the girl leaves, saying she was never coming back. Jai makes the most of the bottle of champagne at hand and drifts off to sleep. Only to wake up next to Diya on his honeymoon, in Thailand. He finds out hes been married for ten days, but has no recollection whatsoever of the last ten days.
Every time Jai goes to sleep, he wakes up in a different year, a different time and place. He doesnt know what is happening to him. And for most part of Baar Baar Dekho, the audience is on the same page as Jai: clueless about what is happening on the screen in front of them.
In all, watch Baar Baar Dekho if you swear by the newer, fitter, leaner, hotter Katrina Kaif and her abs. Theres nothing much to watch otherwise.