The next day, Dave decides to take advantage of being Mitch and takes the day off.
Dave does everything that he finds relaxing, including going to an aquarium and watching a showing of National Lampoon's Animal House at the theater.
After Dave finishes having fun, he calls Mitch to help show him how to act fun on his date with Sabrina that night.
Mitch teaches Dave how to act like him, and finally shaves off Dave's pubic hair.
On the night of her ballet recital, Cara, Dave's eldest child, is about to be pushed by another girl who has a habit of bullying her, but takes Mitch's advice and throws her to the floor, to which Mitch foul-mouthedly cheers.
Cara tells Dave that she loves him and Mitch says the same thing, but feels guilty for doing so immediately after.
Dave Lockwood (Jason Bateman) and Mitch Planko (Ryan Reynolds) are close friends who are each jealous of the other's lifestyle.
The following day, Mitch goes with the rest of the representatives to the new merger meeting between the two firms.Dave gives Mitch advice on how to behave professionally and Mitch sets Dave up on a date with Sabrina, who Dave has had a crush on.After speaking with his father, Mitch rededicates himself to doing everything Dave's life demands, from taking care of the kids and buying groceries to making decisions at the firm.Mitch remembers the wish they made the night before and they drive back to the park, planning to urinate again in the fountain and wish for their original lives back, but find the fountain has been removed for restorations.Forced to wait a few days until the parks department can locate the fountain, Mitch and Dave agree to pretend to be each other for the day.Later, Jamie asks "Dave" about their anniversary party and he asks why Mitch was not invited.She says that he told her not to invite him because he was afraid Mitch would ruin it with his usual antics.The Japanese representatives only offer 5 million to merge, million short of their hoped for 0 million.They are about to agree when Mitch says that he has noticed the firm's representatives have not started leaving, which means they are still willing to up the price, comparing the whole situation to sex and porn.Meanwhile, Dave arrives at Mitch's film shoot to discover that it is a porno.Tired of pretending to be Mitch, Dave has them go back to his house to tell his wife Jamie (Leslie Mann) the truth, but Jamie does not believe him.