Plot summary

Architect Steven Kovacs (Matthew Broderick) moves into an apartment after a failed marriage proposal to his girlfriend Robin Harris (Leslie Mann). Taking advice from his friend Rick (Jack Black), Steven bribes cable installer Ernie "Chip" Douglas (Jim Carrey) into giving him free movie channels. Chip was several hours late, and came when Steven was in the shower. He knew that Robin had kicked Steven out (he saw that the billing on Steven's previous address was changed to Robin).Chip gets Steven to hang out with him the next day and makes him one of his "preferred customers". Chip takes Steven to the city's central satellite dish, where he confides to Steven about being raised by television due to the frequent absences of his single mother. Chip has a slight lisp, but when Steven says his brother is a speech therapist, Chip is offended and ignores him.Chip soon proves to be intrusive as he crashes a basketball game between Steven and his friends (he is a brute player, very physical and ends up breaking the glass panel behind the hoop) and leaves multiple messages on Steven's answering machine. Based on Chip's suggestion Steven invites Robin to watch "Sleepless in Seattle" on cable and it works. But Steven is surprised to see that the cable is out, forcing him to call Chip, who was just waiting outside his door. Steven promises to hang out with Chip in exchange for cable.Following a knight battle between Chip and Steven at Medieval Times, Steven finds that Chip has secretly installed an expensive home theater system in his living room as a gift in return for Steven's friendship. Although Steven declines the gift, he agrees to host a party attended by Chip's other preferred customers before having the system returned. Steven also gifts Chip a self help course on correcting his lisp. In the fervor of the party, Steven sleeps with a young guest, whom Chip reveals the next morning to have been a prostitute Heather that he had hired specifically for Steven. Upon this revelation, Steven angrily ejects Chip from his apartment.To make amends, Chip tracks down Robin, who is dating another man (Owen Wilson). A disguised Chip severely beats the man in a restaurant bathroom and tells him to stay away from Robin. He later upgrades Robin's cable, ostensibly as a gift from Steven. Robin decides to get back together with Steven as a result. However, when Chip informs Steven of his role in reuniting him with Robin, Steven politely ends his relationship with Chip.Devastated, Chip sets out on a series of vengeful acts. He gets Steven arrested for possession of stolen property (The arresting officer is Chip's "preferred customer") and mocks him through a prison visitation window by suggesting that Steven is gay. After being released on bail (he is bailed out by his dad Earl Kovacs (George Segal)), Steven is further embarrassed when Chip attends dinner with his family (Earl, Mrs. Kovacs (Diane Baker) & brother Pete Kovacs (Bob Odenkirk)) and Robin. Following a Sexualized version of the game Password, Steven openly berates Chip (when he suggests that RObin showed him the birthmark on her back, which he saw while spying on her while installing cable) and punches him (the entire family thinks Steven is nuts and rallies behind Chip).The next day, Steven is fired from his job when Chip transmits a privately recorded conversation (he had a spy camera installed in Steven's house), in which Steven insults his boss, onto the company's computers.Rick investigates Chip at Steven's request and finds that Chip was fired from the cable company for stalking customers, and uses the names of various television characters as aliases such as Chip and Ernie Douglas from My Three Sons and Larry Tate from Bewitched. Chip calls Steven that night, telling him he is paying Robin a visit. After visiting Robin's empty apartment, Steven tracks them down to the satellite dish, where Chip holds Robin hostage in a rainstorm. After a physical altercation and a chase, Steven is able to save Robin and battles Chip. As the police arrive, Chip apologizes to Steven for being a bad friend.Chip, proclaiming that he must "kill the babysitter" to prevent others from becoming like him, dives backward from the top of a ladder above the satellite dish, falling onto it and knocking out the television signal to the entire city. Chip survives the fall with an injured back, and bids Steven farewell before being hauled away in a rescue helicopter. When one of the paramedics addresses him as "buddy", Chip asks the paramedic if he is truly his buddy, to which the paramedic replies "Yeah, sure you are", causing Chip to smile deviously, implying a repeat of Chip's stalking cycle.