As a child I had chronic UTIs and at two and a half I had to get an MRI to see if there were structural problems. If you've never had an MRI, they are loud and scary and no toddler is going to sit still through one, so they put me under. What wasn't known at the time was that I have a resistance to those meds so I woke up about halfway through. Here's a little conjecture, it's not common to put someone so young under anesthesia so they must have brought in the residents to watch. Everyone was all scrubbed up, apparently my dad was in the room too but I didn't even recognize him.

I saw what I assume people see when they're abducted by aliens. I woke up, paralyzed on a table, not wearing my clothes, with a bright light above me and a lot of commotion from what I didn't recognize as people until I was knocked out again.

Woke up later holding a stuffed panda which made it all worthwhile so I didn't even bring it up to my parents for about 15 years because I wasn't sure it really happened.