<human>: A few nights ago I fell asleep with a contact in.  I wear the disposable ones that you are definitely not supposed to sleep in.  I wake up the next morning and realize what I did, and frantically search all through my eye trying to find it.  No luck.  I assume it must have fallen out during the night.  I check a few more times over the next couple days, but don't find it.

A few days later I'm doing some yard work and get concrete dust in my eye.  I go into the bathroom and proceed to flush it out.  I know I have all of it out, but it feels like something is still in there... and I realize it's probably my contact and it's been on my eye for about 4 days.  

I freak out and read online that disposable contacts can adhere to your eye if left on for too long.  So.. I start trying to get it out.  I can feel it, and I can see it moving across my eye.  I'm poking, sliding, and pulling on it as much as possible.  It's REALLY starting to hurt at this point.  I finally get it between my fingers and can see it coming off my eye, but it slips back.

Finally I've had enough, and terrified I'm going to go blind, I head to the Emergency room.  It's exceptionally crowded and 6 hours later I finally see a dr.  He looks all through my eye and can't see a contact.

Finally he puts some drips in and looks at it through a UV light and yells (I shit you not..) "Oh wow!  Hey guys! Come look at this!!"

My cornea was very scratched in multiple places.  It turns out what I thought was my contact, was actually me just pulling and pulling and pulling on my actual cornea. almost tearing it off...

So Reddit:  What's the stupidest thing you've ever done to injure yourself?

Can you summarize the given text in a few sentences?
<bot>: I thought I had a contact stuck on my eye, so I pulled and pulled on it.  Turns out there was no contact, I was literally just pulling the cornea off of my eye.