February 15, 1982: Bob Barker thanking the audience members who sent sympathy cards following the death of his wife Dorothy Jo, with the day's big winner Susan McCormick giving Barker a brief hug to console him.
February 28, 1992: While playing 3 Strikes +, Toni yells at her son in the audience after he gives her bad advice. Bob Barker then invokes Laser-Guided Karma after she draws two strikes: "Notice that your luck has changed since you said those things about your son?" Toni then gives a heartfelt, "I'm sorry, baby!" Her son rushes onstage to congratulate her after she wins her showcase, and they hug.
February 19, 2002: A contestant named Percy wins a car in Money Game fresh off having had his car totaled. He becomes emotional both when the car is revealed and after he wins, even thanking God and Jesus for his incredible fortune so soon after going through such a terrible plight.
September 4, 2012: On the 40th-Anniversary Special, contestants who won prizes years ago returned for another chance to win. One woman who returned told the story of how she came onto the show the first time: she had gone through a divorce and became homeless. She didn't get a ticket to appear on the show at first, but she sat in front of the studio and managed to get in. She won $12,500 in Plinko, $1,000 more on the Big Wheel, and finally the Showcase for a total of $48,578. She wasn't homeless anymore after that.
December 12, 2013: Almost all of the episode celebrating Bob Barker's 90th birthday. He entered to the sound of an excited crowd (and the original Barker-era TPIR theme music), called a contestant to "come on down," presented one of the Showcases (to the contestant he called on down, no less), and at the end, he and Drew did the "have your pet spayed or neutered" plug together.
Later in April 2015, a theme show featured all engaged couples as contestants. Towards the end of the show, they were all married in a mass wedding conducted by Drew, who got a licence to perform weddings for the occasion.
September 22, 2017: As part of premiere week, all contestants who spun $1.00 during Showcase Showdown got $10,000. During that day's second showdown, all three contestants spun $1.00. The third got 85¢ on his first spin and, while the wheel was slowing down on his second spin, the other two contestants cheered him on. When he got 15¢, all three contestants high-fived each other and shared a group hug.
Say what you will about the 2012 revival of the Australian Price, but Larry Emdur's tribute to Ian Turpie (host of the 1981-86 and 1989 versions), who passed away a few weeks before this version began production, on the premiere was pure class.
This "TPIR Lullaby" clip from Buzzerblog shows you can never be too young to begin to enjoy The Price is Right.