10 Worst Things Black Widow Has Ever Done
8. Beating Up Spider-Man - The Amazing Spider-Man #86
The Amazing Spider-Man #86 is well worth a read, if only because it shows Black Widow absolutely trouncing an ill and thoroughly confused Peter Parker.
Were Black Widow to have had legitimately any reason to fight Spider-Man aside from "because it sounds fun", this would be a completely badass moment. As it is, it leaves Natasha looking like she started a needless fight - because she very much has. Similarly, the fact that she doesn't pick up on the fact that he is ill and thus she isn't getting a proper fight out of him is also pretty dire, as she's beating up a guy she could defeat by just... withholding Lemsip.
Why exactly Spider-Man was a proverbial punching bag for much of the eighties is unknown, but Black Widow takes this a step further by deciding to pick on him for the sheer joy of it.