I think the holy trinity of modern bizarre knockdown reactions might be Odum/Gonzalez, Judah/Kosta & Donaire/Montiel... This one is a combination of the flailing about of the Donaire/Montiel bout with the chicken dance of Judah. What are some good classic examples? This content is protected
The first knockdown of Holmes by Tyson. It's a weird slow-motion fall backwards while his body remains pretty stiff.
Some of the knockdowns that Foreman dished out on Frazier were pretty bizarre looking, almost like a cartoon.
There was a really good one from the Tony Martin-Kip Diggs fight years back. Diggs was dominating the fight, but was clipped by a short left hook that knocked him down. He got up and complained that he was hit behind the head. When the action resumed, he went back to boxing for a second, then suddenly turned and started stumbling in some random direction. Martin pounced at that point and stopped Diggs. One of the stranger ones I've seen. This used to be on YouTube, but has been taken down.
This Pineda guy got dropped by KSI a couple times and claimed he was rabbit punched every time. Not really sure if this qualifies as a "fight" though. This content is protected
Canizales had a man crawling on all 4 for a brief moment after a knockdown. @ 7:13 This content is protected