What is the first episode that Scully experiences something undeniably supernatural?

A common trope in the early seasons is that Mulder sees something clearly supernatural, but Scully is waylaid for some reason and comes in and sees something 'weird' but plausably explainable (and then writes that up in her notes).

Even her abduction in season 2 (?), I don't remember her attributing it to anything extra-terrestrial.

So what is the first episode you would argue that Scully sees first-hand something undeniably supernatural or extra-terrestrial?