[supercat]

Apparently, the temperature differential between your body and the liquid nitrogen is so great that the radiant heat from you hand causes the stuff to instantly boil and forms an insulating layer of gas between them.

The Leidenfrost effect. If your dip your hand in water, you can then very briefly dip it in molten lead with similar non-effects, but only if the lead is hot enough. Otherwise very bad.

[HiTech RedNeck]

With either the lead or the liquid nitrogen I'd be afraid of splashes.

[Paleo Conservative]

The Leidenfrost effect. If your dip your hand in water, you can then very briefly dip it in molten lead with similar non-effects, but only if the lead is hot enough. Otherwise very bad.

Hopefully the producers of Jackass will not find out about the Leidenfrost effect