A man was left with half a skull and has no idea what happened to him.
Brandon Alexander remembers leaving his house to go and buy food for himself and his mother, but woke up three days later in hospital.
Unable to find any camera footage, or any trace of an emergency call, he wanted closure after the incident, which saw him undergo life-saving surgery.
The 21-year-old content creator left his house on his skateboard and followed his normal route, stating he was travelling at an appropriate speed.
He said: "I know these streets like the back of my hand. I know this skateboard like the back of my hand.
"There is no way I just fell. If I did just fall, I would have some sort of cuts on my hands because obviously I would have braced myself as I fell, but there isn't any of that.
"There's no camera footage, no 911 call, no hospital footage and there's a very vague hospital report that's been investigated by numerous authorities. I've got no answers, there's no explanation of how I got to the hospital.
"I was checked in to the hospital just after 9pm, 23 minutes after I'd left the house to get food, luckily I've recovered well following the surgery."
Brandon, from Manhattan, US, was in a coma for three days before he became fully conscious.
He was left with his head having a sub growing hematoma and a haemorrhage, as well as a complex temporal bone injuries.
It meant the bone connecting the jaw to the skull was fractured in multiple parts on the left side of his head.
Brandon knows there's a lot more to his accident and wants answers, but tries to not let it get him down.
He added: "I miss my life, I miss the hustle and I miss waking up in the morning and getting stuff in life done, the accident has left me really helpless.
"There's definitely some bitterness in the fact there's no closure because I have this very horrible, traumatic event happening, and yet everyone who has these types of accidents, at least in some way, shape, or form, knows what's happened to them.
"They know how stuff like this happens, how they fell, where they were and what caused it.
"I know with every fibre of my being that I didn't just fall.
"The amount of people who've told me, oh, you just fell get over it, but I don't just fall, I've put in over a thousand miles on the skateboard every day from point A to point B all over the city.
"I'm not going to let this keep me down though. I'm going to get back to where I was, and if not better!"
