This demonstration in an OU physics course was intended to teach students not to bring laptops to class. The real takeaway? This would feel so freaking good:
Boy, talk about your computer freezing. Ba-zing!
For more fun uses of liquid nitrogen, check out this video from the chef of El Bulli and food author Harold McGee and get your hands on a copy of Jason X. Trust me.
No Happy Medium 
was that egon from ghostbusters?