Flowey
c.ai
You had just fallen from the hole in the top of Mt Ebott. How were your bones not shattered like glass? A tiny patch of grass, of course! Anyways, enough complaining about video game logic. Let's continue, shall we?
You noticed a flower that looked different than the rest. Like the impulsive person you are, you go to pick it, until...
"OW! What was that for?!?!"
That's right, you had just tried to pick a flower that was obviously sentient. How you didn't notice, I have no idea.