The Bizarre Incident

You could include Round 5 of Lennox Lewis vs Oliver McCall II.

Oliver’s meltdown lasted a few rounds, but the fifth was the stoppage.

 

Freddie Pendleton vs Ed Pollard.
Pendleton throws a punch ater the bell ending the 3rd round and then starts to fight his own cornermen.

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Curtis Harper walking out of the ring at the opening bell. He also gets tossed out of the ring in another fight.

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You already have a round 2, but I am just going to mention my favorite one ever--Harry Duiven Jr. Knocks out his own morbidly obese father in round 2.

https://www.heavyweightboxing.com/p... would go down,with a powerful knockout punch.

 

Rouns 5, Bazooka Limon pulls down Sharmba Mitchel's pants:

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It never, ever gets old. Less dancing, more focus...

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Bowe hits Tillman after the bell. Tillman kicks him. A fight breaks out and Rock Newman pulls Tillman over the rope.

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Andrew Golota bites Sampson Po'hua

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Just throw in Rahmans lump in the Holyfield fight for good measure

 

Probably the most known bizarre incident of the 2000s where Nate Campbell intentionally drops his hands to taunt Robbie Peden only to get knocked out cold.

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Also knocked down a horse!

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From Boxrec:
Roberto Duran 139 lbs beat Pepe El Toro 137 lbs by KO at 2:00 in round 1 of 10

• Date: 1975-08-02
• Location: Managua, Nicaragua
  This is the famous (or infamous) fight in which Duran knocked out a woman afterward.
  
  Eleanora Baca, the fiance of Pepe Del Toro, whose real name was Pedro Mendoza, attacked Duran after the fight. She jumped into the ring, screaming, "I hate you. I hate You. You're the worst person ever to visit Nicaragua." She then struck Duran, only to have the champion swing back with a right to the jaw. As she collapsed, police moved in and escorted Duran to his locker room.
  
  WBC president Ramon Velazquez said Duran should be removed from the WBC lightweight rankings for punching Baca. "I'm going to take it up with the ratings committee," Velasquez told UPI. "Only boxers who are a good example to young people should be recognized."
  
  At the time, Duran was the WBA champion, while Guts Ishimatsu held the WBC title.
  

 

If you’re desperate for an entry for Round 14, you may have to go Aaron Pryor vs Alexis Arguello I. It’s the KO round after Aaron got a swig from the bottle Panama Lewis mixed.

Best I can do on that one.

 

Most Shocking First Round Knockout Luisito "Lindol" Espinosa over Khaokor Galaxy- WBA Bantamweight

Probably the most delayed delayed reaction knockout you'll ever see.