I went to Wikipedia to see if it had anything. It claimed no video of the Shoe Banging event was made . I’m thinking ‘Who am I going to believe. Wikipedia or my lying eyes?’
I just did a google search for “nikita shoe gif” and voila.....could be fake but looks pretty real to me. Also, looking at the timing of Nikki’s banging, I think that is where Queen got its idea for the song “We Will We Will Rock You”, changed a bit from Nikki’s “We will bury you.”