#2 Blading
WWE's relationship with blood has been a winding road.
At times, blood was accepted and even encouraged, as some of the most iconic shots in wrestling involve the infamous crimson mask.
At other times, including our present period, blading has been banned and can leave you with a hefty fine if you're caught.
Any blood nowadays is accidental, including at WrestleMania 34 when Brock Lesnar destroyed Roman Reigns to retain the Universal Championship.
With the product rated PG, don't expect blood to return to WWE, as the company fears copycat injuries from impressionable fans, as well as a PR nightmare.
The final nail in the coffin is NXT UK's Nigel McGuinness, who was forced to retire after contracting Hepatitis from a blade job and is an example as to why blood should never, and will never be brought back.