Fair comment Matt, but then someone from 200 years ago would have said the same about things which today are in every schoolkid's textbooks as known scientific fact.
there are quite definitely some very weird things going on in this world, and it would be foolish to claim that we knew what all of them were.
There are a lot of things we don't understand - yet - but I don't think it proves that these are necessarily of an alien origin.
What I do take with a pinch of salt is the sightings that are reported in the press and contain the lines " after enjoying a night out drinking with friends...."
Likewise, why do they always choose to appear to people who are in the middle of nowhere and (forgive me) have low intelligence and plausibility levels? Why not trot out the old line "take me to your leader" or make some meaningful public appearance?
And yes, I am a professional sceptic!