Yeah, I don't remember the exact name for the phenomenon where liquid nitrogen "distills" LOX out of the air under certain conditions
LN2 is colder than LOX so a surface cooled to LN2 temperature in an oxygen atmosphere will have LOX condense on it...
One incident report that I read that stuck out in my mind was the following:
A holding tank was being filled with LN2 from a tanker truck through an insulated hose. There was some insulation missinh and so over the course of the lengthy filling, air came in contact wit the LN2 temperature steel- LOX condensed and dripped onto the asphault. After the filling was done the tanker truck drove off, and some poor unsuspecting guy, makes the mistake of dragging a steel cylinder over the LOX soaked asphault. What resulted was a 'sizable detonation'. If I remember there were only minor injuries.
Check out this site: WARNING, ONLY ENGINEERS OF THE MALE PERSUASION WILL APPRECIATE THIS CONTEST TO SEE WHO CAN GET A CHARCOAL GRILL STARTED THE FASTEST...
http://ep.llnl.gov/msds/Chem120/lox-oxidation.html
Lighting a grill with 3 gallons of liquid oxygen. Started with 60 lbs of charcoal; burnt up 40 lbs of it in 3 seconds. Result is a grill ready to cook in about 3 seconds, and all the old grease, etc burned off. Don't try this at home.
WARNING: an ignition source, such as a lit cigarette or one glowing coal, must be present before pouring on the LOX. If charcoal is PRESOAKED in LOX first, an explosion will result. One briquette presoaked in LOX is approx equiv to 1 stick of dynamite.