#2 Didn't get along: Rowdy Roddy Piper and Mr. T

The first WrestleMania was a show unlike any other, and the main event saw Hulk Hogan and actor Mr. T take on Roddy Piper and Paul Orndorff.
The match was certainly a success, as the next year, Piper and T faced off in a boxing match, which even by the standards of the kindest of fans, stank.
In the years since though, Piper did not pull any punches (pun intended!) in his criticism, saying that the A-Team star was untrained, unprofessional, and had no business being inside a wrestling ring.
These were harsh words for sure, though Piper did make amends with the former B.A. Baracus before his passing in 2015, as the pair bonded over their roles as fathers, and saw T enter the WWE Hall of Fame in 2014.
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