Occasionally he would even acknowledge mistakes made by the heels, including those made by his personal favorites such as Savage or wrestlers managed by heels Bobby Heenan and Jimmy Hart. One notable exception to this rule was the WrestleMania VI Ultimate Challenge title for title match between WWF Champion Hulk Hogan and the WWF Intercontinental Champion, The Ultimate Warrior. Since they were both fan favorites, Ventura took a neutral position in his commentary, even praising Hogan's display of sportsmanship at the end of the match when he handed over the WWF Championship belt to the Warrior after he lost the title, stating that Hogan was going out like a true champion. During the match, however, which was also the last match at Wrestlemania he called, Ventura did voice his pleasure when both broke the rules, at one point claiming, "This is what I like. Let the two goody two-shoes throw the rule book out and get nasty." Ventura's praise of Hogan's action was unusual for him, because he regularly rooted against Hogan during his matches, usually telling fellow commentator Monsoon after Hogan had won a championship match at a Wrestlemania that he might "come out of retirement and take this dude out". Hogan and Ventura were at one point close friends, but Ventura abruptly ended the friendship in 1994 after he discovered, during his lawsuit against McMahon, that Hogan was the one who had told McMahon about Ventura's attempt to form a labor union in 1984. Following a dispute with McMahon over the use of his image for promoting a Sega product, while McMahon had a contract with rival company Nintendo at the time, the promoter released Ventura from the company in August 1990. Ventura later served as a radio announcer for a few National Football League teams, among them the Minnesota Vikings and Tampa Bay Buccaneers. In February 1992 at SuperBrawl II, Ventura joined World Championship Wrestling as a commentator. WCW President Eric Bischoff ultimately released him for allegedly falling asleep during a "WCW Worldwide" TV taping at Disney MGM Studios in July 1994, but it has been speculated that the move may have had more to do with Hogan's arrival shortly before. In 1987, while negotiating his contract as a WWF commentator, Ventura waived his rights to royalties on videotape sales when he was falsely told that only feature performers received such royalties. In November 1991, having discovered that other non-feature performers received royalties, Ventura brought an action for fraud, misappropriation of publicity rights, and quantum meruit in Minnesota state court against Titan Sports, asking for $2 million in royalties based on a fair market value share.