Plot
On New Year's Eve of 1999, Minnie Vernon is in her mid 30s. A hospital anaesthesiologist, she sees her ex-fiancé Cameron, who she had split from after many years. There for his child's birth, she is shocked, as he had not wanted kids. Cameron reminds Minnie they broke up because she had slept with Joe, her former university boyfriend.
Dissatisfied with her life, as everyone seems to be doing better than her (lately she has been living on Flick and Max's sofa bed), she unenthusiastically accompanies them to Rodney's New Year's party, as she discovers Joe is back from NYC. Minnie wields a 10-year-old bottle of tequila with her, which she later discovers causes time travel. Pia, Rodney's IT wife, fears the Y2K bug, which Rodney teases her about. Minnie is shocked to meet Joe's American girlfriend Jenny.
Not feeling support from Flick-Max after whinging to them on the balcony about Jenny, Minnie tries to stomp back into the party. Oblivious to the sliding-glass door being closed, she slams into it. Joe hurries to her aid. As he is helping Minnie in the bathroom, he almost kisses her but she pulls back. When she then tries, Joe pulls back.
Returning to the party, three of the former university mates (Rodney, Joe and Flick) reminisce about their decade-ago Mexico trip. At the countdown to midnight, the lights go out at 12. Pia panics, then Rodney jokingly turns the electricity back on. Minnie unhappily realises Joe is proposing to Jenny.
Minnie takes a swig of tequila, ending up at the door of the house again. As scenes repeat over again, she realises that each shot restarts the night. Therefore, Minnie calculates she has a bottle's worth of shots to change her millennium life's trajectory by winning back Joe.
However, try as she might, Minnie never can repeat exactly the parts of what she remembers in her favor. Every time, different factors come into play and the outcome gets weirder and weirder. Once, Joe confesses to Minnie that while in the States he experienced alcohol poisoning from partying too hard. Hence, he has been sober over three months.
In yet another, Minnie lies down shortly after arriving. She wakes directly after Rodney pranks Pia via the Y2K bug and the proposal. When Jenny reveals her pregnancy, Minnie loses it, then discovers that noone wants her there.
Dejected, Minnie takes Flick's car keys, but soon gets pulled over by the police. The breathalyzer registers the over half bottle of tequila in her system, so they start to arrest her. Realizing they will confiscate the bottle of tequila, leaving her stuck in this timeline, Minnie takes one of their guns. She forces them to return the bottle, so she can restart the evening.
Minnie restarts even more recklessly, dumping Pia's lifesavings for everyone and having sex with C-Word. This time Rodney sees the tequila, recognizing its power. He tries to take it from Minnie, but she resets the timeline again, then immediately goes to Rodney, insisting he explain about the tequila.
Rodney confesses that many times in his life he did redos. He repeated his University exams and redid parts of his relationship with his now wife Pia. Rodney has not touched the tequila since before his daughter's birth. As he wants to remember what has transpired between them, he insists they share the last of the tequila.
So, finally in the last timeline, Minnie decides to right many of her wrongs. She fetches the ice she was meant to have brought. Rodney overdrinks, so Minnie acts as his buffer. The moment she lowers her guard, he lunges for the worm. Pia comes in, and supports him.
This time, Joe smashes into the sliding door so Minnie looks after him in the bathroom. They have a good closure chat, sealing it with a kiss. Jenny sees, getting the wrong impression. In front of the whole group, Minnie almost eats the worm but then chooses to talk things out. Saying she and Joe were each other's backup, she insists Jenny is the real deal.
In the morning, all of the old friends and their partners are enjoying themselves. C-Word, having always been in the background, swallows the worm and disappears definitively.
