The newspapers and internet are full of the incident of the shredding of Banksy's painting 'Girl with balloon'.
But (Quoting from BoredPanda):
People Were Amazed By Banksy’s Painting Shredding, But One Artist Noticed That Something Doesn’t Add Up
His (three) arguments about the construction as shown in the Banksy video:
Those are pretty clearly x-acto blades attached to a piece of wood [...]. Presumably they are what is doing the actual "shredding". [...] but... they're mounted SIDEWAYS. You can see that there is no way these blades would cut canvas [...] mounted that way.
But you can see the blades are actually NOWHERE NEAR where the painting sits.
They're almost entirely towards the BACK of the painting. This would only really make sense if that was where the painting was going to come out [...] why would you put the blades there and have the painting come out of the front*
When the wheel turns, the ACTUAL print is funneled back into the frame. It's safe. And simultaneously,a (halfway) pre shredded COPY is forced out of the bottom.
He refers to this Youtube video by Knoptop, who actually made a miniature "Banksy Self-Destruct Shredding Artwork".
Was the Banksy picture in the frame shredded immediately after the auction?
* Personally, I find this argument the least convincing, because rollers can be used.