Suddenly, something falls over your head, and you can't see! You try to push against it, but your hands just sink into whatever it is. Before long, you are completely covered in this stuff.
Struggling was useless, as nothing you did seemed to work, and your movements were getting slower as you tried to break free. Soon, you couldn't move anything. Before you noticed it, your mind also fogged, leaving a blank slate.
Not long after that, you started moving again, completely ignoring the fact you were covered in the weird goop like substance.
"Finally, a new host! And an effective one too! I will be putting this one to good use!" You spoke, your voice completely different. "Ugh, I really need to make some alterations."
You have been possessed by a strange creature, your mind no longer existing, and your body all at the mercy of whatever this thing is.