Around here we joke that you need a nuclear bomb to get the packaging open on just about everything sold in America these days. Mr. Boy can’t even open his fruit snacks and fruit leather plastic wrappings with his fingers, nor can I. You need a ballpoint pen to puncture them first. As for the "clam shell" plastic covering on stuff from toys to printer ink cartridges, with their sharp edges, it takes a pair of scissors and infinite care not to wind up bleeding all over the product.
Indeed, "according to the Consumer Product Safety Commission, injuries from plastic packaging resulted in 6,400 visits to emergency rooms in 2004," reported here, which includes claims from some packagers that they plan to soon start making it easier to open the clam shells. We’ll believe that when we see it.
THE TEXAS SCRIBBLER 
A Swiss Army Knife works.
Not for me. I prefer scissors.
The knife I have has a small pair of scissors.
Must be tough scissors. The clam shells are tough stuff. I suppose a razor blade might open them, if you’re very careful not to cut your fingers.
Yep. I vouch for Swiss Army knife too. Even when in the kitchen, I tend to run to my corner looking for it every time a package needs a surgery.
Oh well, I used to keep it in my pocket as a key holder. No more, alas, with the airport and other security…