#1 CM Punk lost the WWE World Heavyweight title to The Undertaker in 2009
CM Punk is one to live by his own rules, which got him into trouble when he was a part of WWE. The former WWE Superstar won several world titles in his stint with WWE, which ended in 2014.
Punk, who held the World Heavyweight Championship thrice, was reportedly punished by WWE in 2009 for some unusual reason, losing his title to The Undertaker at 2009's Hell in a Cell pay-per-view.
As per reports from then, Punk had backstage heat due to something that happened in WWE's European Tour. The Undertaker reportedly told Punk to dress in a more formal way as he was the World Heavyweight Champion and was representing the WWE. Punk was reportedly "confrontational" with The Undertaker, and argued with The Deadman that John Cena - who was a champion then - hadn't dressed "the part" as well.
These attitude problems and the clash with The Undertaker reportedly resulted in Punk being punished and stripped of the title. The report also said that Punk had argued with those backstage about them ending his title reign.
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