I had this dream last night. My dreams never make any sense, they are just bits and pieces of nonsense usually. The gist of this one, leaving out the nonsense bits, was that I was standing with a friend and saw something falling from the sky. It looked like a small cannister of some sort. It hit the ground, and before I could reach it, another person picked it up and opened it, and their eyes opened wide in shock and they started to take out some paper(s) and run off with them.
Before they did, I grabbed the paper to see what it said, part of it was a drawing of a person seeing an alien (this part I'm fuzzy on). You know the idea of a person trapped on a desert island who sticks a note in a bottle and throws it out to sea and hopes somebody finds it and recsues them? Well, as I woke up, I was given the thought that this "cannister" was the equivalent of the bottle thing, and somebody who was being held by aliens sent it out...
Before they did, I grabbed the paper to see what it said, part of it was a drawing of a person seeing an alien (this part I'm fuzzy on). You know the idea of a person trapped on a desert island who sticks a note in a bottle and throws it out to sea and hopes somebody finds it and recsues them? Well, as I woke up, I was given the thought that this "cannister" was the equivalent of the bottle thing, and somebody who was being held by aliens sent it out...

), not necessarily of aliens per se (though it could be), but of a person being held in thrall by something foreign to them. The drawing is a sort of second-hand memory, as opposed to witnessing something directly. The person who ran away seemed to want to keep the information from you. And it came from "out of the blue". Unexpected and by surprise.