Don't ever say wrestling is fake, because there's nothing phony about the physical punishment these athletes withstand.

Professional wrestling used to be an extremely secretive business, with the performers never admitting publicly that their matches were predetermined. For many years, fans believed wrestling was 100-percent a shoot, but others attempted to call out legends of the ring and get them to spill the reality of the art form.

One of the most charismatic defenders of kayfabe was Macho Man Randy Savage. While taking calls on an early '80s public access show, Savage defended the business like any professional would have.

"Zero. Nothing," Macho Man responded to a caller asking how much of wrestling was "fake." "Professional wrestling [is full of] super athletes training all the time for money at the top. The money is better the higher up the card you go. There's very little reason in my mind why I would go on television and do anything to make me look ridiculous. If you can give me [a reason] give me one now."

After a few seconds of silence, Macho Man stated, "Yeah."

Another heated moment came from Becky Lynch just hours before she was set to headline Wrestlemania 35. In the buildup to her match against Charlotte Flair and Ronda Rousey, Rousey called wrestling "fake" on her social media.

"It's almost laughable," Lynch responded. "That is the same woman who disrespects our business when the rest of us are out working 52 weeks a year, at least five night [a week]. We are on the road, in hotels more that we are at home in our own beds. That's the life that we choose, but that's the life that we love, and we do that so we get the opportunity... hopefully one day... to main event Wrestlemania. She is handed that opportunity. How dare she disrespect my business."

10 Infamous Receipts in Pro Wrestling History

In pro wrestling, a "receipt" is an ass-kicking that you brought upon yourself. It comes from the cardinal rule of the business -- always take care of your opponent. If you fail to do that, the repercussions will fall squarely on your head (often via chair shot).

The Undertaker recently explained the purpose of giving receipts in wrestling. "I'm pretty patient [when it comes to giving a receipt]. It all depends on intent," the Deadman said. "Some guys just work very snug. I pride myself on my punches. I feel like I can make it look like I can take your head off and not touch you. Every once in a while one gets away from me... I'd much rather it be there than it miss. It ain't ballet."

But not all receipts come after a stiff shot gets away. Sometimes a performer delivers a receipt to protect themselves from an unsafe worker, like when Taker had to shut down Giant Gonzalez at Wrestlemania IX. "[Gonzalez] cracks me right across the back of my neck, and then once I get back the feeling in my little fingers... I flipped," Taker recalled on his podcast. "I turned around and just started wailing on him."

Let's go back to classic WWE, the old territories, and even a battle between monsters in Japan. Here are 10 of the most infamous receipts in pro wrestling history.

Gallery Credit: WWE / NWA / HWA / YouTube