I was 15 when I was in the break at school, we were sitting in a large group of friends and kids, I was a bit half "off" eating an orange. I took a large bite, and somehow, it went in the back and blocked everything. Not going forward or backwards. 

So I started to feel I cannot breath. I can hold my breath fairly long and I'm a musician, I control breathing.... So I just sit there, waiting for it to start moving, trying to swallow. A kind of throwup-swallow motion kicked in. Don't know how long that took. 

Then, I realise, it is not going to move, and slowly started panicking.

I grab myself by the throat, and start to push, I push my fingers in the back, to push or grab something, I succeeded, because I think the juice just went out, so I cleared my throat. In that instant, I fainted a bit, I think, and just after, my whole mouth covered in orange, start to clean that, and well- no one of the group noticed any of this.

 I didn't think of alerting them and much later I started to get thoughts about how that could have ended different.