What's your trick to defeating the evil "frustration packaging"?

It seems like every product I ever need to buy comes wrapped in this stuff. That hard, plastic, tamper-resistant casing. There’s a wikipedia article dedicated to the emotional effect of trying to open it.
Today I spent 10 minutes trying to free my new calculator from this foe, and my hands suffered multiple casualties in the journey.

What do you do to easily get your product out of this?