But you couldn't get your hands on industrial quality liquid nitrogen?
(if you can allready, then there is no need to look at this)
Well now you can! sort of.
the stuff were using is not liquid nitrogen, but something that is commercially avalible:
COMPRESSED GAS DUSTER! YEAH!
Step 1: Other stuff you'll need
1 compressed gas duster(as mentioned)
1 thin walled balloon(like a water balloon)
1 means of holding the balloon(hands might work but they might freeze)
WARNING:THE GAS IN THE COMMPRESSED GAS DUSTER IS FLAMMIBLE!
IT IS YOUR OWN RESPONSIBILITY IF YOU WANT TO USE IT AS A FLAMETHROWER(whoops)
WARNING(again):THIS STUFF CANOT ONLY CATCH ON FIRE, IT IS REALY COLD I WILL NOT TAKE ANY RESPONSIBILITY FOR FROSTBITTEN OR BARBEQUED FINGERS; ATTEMPT AT YOUR OWN RISK. MAXIMUM VENTILATION RECCOMMENDED, OUTSIDE IS THE BEST WELL AWAY FROM ANY SOURCES OF FLAME!