#2 Undertaker and Brock Lesnar broke a golden rule
The feud between Brock Lesnar and The Undertaker was easily one of the most brutal in recent memory. The two men collided in a number of hard-hitting matches, but it was their encounter back at Hell In a Cell in 2015 that put the two men in hot water with Vince McMahon.
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In order to add an "edge" to their match, both Lesnar and The Undertaker bladed to add some blood into the mix. Vince McMahon hasn't allowed WWE stars to blade on TV since going under the PG umbrella, so he was reportedly furious backstage with the two men defying his instructions.
Bryan Alvarez of The Wrestling Observer noted that he had received a text message from an employee that stated that Vince McMahon was furious.
“Vince freaked the f**k out. There’s no polite way to say it. Kevin Dunn freaked out and screamed to get a doctor out there.”
Lesnar was reportedly at the center of the controversy since he collided with a ring post before he "bladed."