What evidence do we have that these phenomena are strictly natural?
There are some ingenious explanations in this thread of how you could create something like this effect with known technology.
If we don't a priori eliminate it on the grounds it is impossible (as a Christian, I do not, but many here do), I imagine that supernatural beings trolling humans (especially modern scientific reductionists) could look a lot like this and is also a plausible explanation.
If you have a grudge against the concept of the supernatural, maybe think of it as "graduate students got drunk and starting messing with the Earth-universe simulation".