Oh wow, thanks for the feedback. Even though we seem divided over my question, its informative to see what views of the community is. Thanks Viper for your views as well as your personal experience (primary source! =D) and now I know I'm not
that crazy to think that the idea of tickling someone into passing out is very hot. Your replies are kinda insightful. However, it does appear that this fantasy is in the minority of the community (le sigh~)
From what I can see, the point mostly being debated here is if making someone faint is an
acceptable risk. Many many things have risks, ranging from swimming alone, to swimming with a life guard, to holding someone under water out of...fun?. But anyways, the point is, acceptable risk. A lot of you feel that the perceived risks outweigh the benefits (it doesnt get seem to get you off lolz). However, it's also apparent that we're kinda speculating around some points (arguing over tongue swallowing, but not literal tongue swallowing, but tongue-blocking-airway-if-laying-on-your-back, but not tongue-blocking-airway-if-on-your-side-or-sleeping-for-some-reason). If people want to continue debating over this (please do btw), it would very helpful references were cited (doctor told me this, following site said blah)
Currently, I'm trying to how exactly fainting from tickling would fall under (there are actually many types of fainting:
http://en.wikipedia.org/wiki/Syncope_%28medicine%29)
I've also read about something called laughter-induced syncope which is where you faint from laughing too much.
http://en.wikipedia.org/wiki/Laughter-induced_syncope
And while oxygen deprivation to the brain carries risks of cell death, this risk is proportional to the time of oxygen deprivation. Since the person tends to be lying down, (more blood flow to the brain), and since the person resumes breathing after fainting, its very possible that oxygen deprivation will certainly be below the 5 minutes when cell death starts to happen from acidosis.
So if anyone has sourced arguments or just wanted to throw their opinion out there, feel free~ (any med students out there?) Thanks again~