Many extreme overclockers use LN2 for their systems, but it's dangerous and can hurt you. Well, if you have LN2 you can also do funny things (but it's still dangerous). See what can you do with LN2 that can be dangerous. You can extinguish a BBQ, cold some coctails (but dry ice is better doing that), freeze some objects to break them and many other things, we also show how to not use a thermal probe in a LN2 dewar and things like that..
Check it out over here (the article is in Spanish).