Hey Johnathan;
It's cool dude, I know you're not being argumentative.I was just pointing out that LN2 does have some risks associated with it. I might try the graham cracker trick on myself, or even among friends, but I would not feel comfortable doing it with someone else's child as part of a trick-or-treat gimmick. That's just me though...
The first link in my post above details the results of someone swallowing a small amount of LN2. He remembered from college that you could pour some on your tongue and not get burned (leidenfrost effect), but for some reason his memory was sufficiently clouded that he thought you could swallow it as well.Damn near killed him...
Adam