I don’t think the first paper was actually handed in to the wrong professor...
It was just written very poorly...
lol.
If the paper was on a totally different topic, it was indeed very very poorly written.
I thought it was downloaded from the internet and the student didn’t bother to change the vital statistics.
BUT even if the student did honestly hand in the wrong paper, it sounds like the proverbial straw that broke the camel’s back!