Metal Gear Solid 2: Sons of Liberty2001

Iroquois Pliskin:
The cardboard box that you have is ideal for fooling your enemies. It's a very important tool for infiltration missions.

Raiden:
Really?

Iroquois Pliskin:
Of course. I can't begin to count the number of agents whose lives were saved by a cardboard box...

Raiden:
You mean everyone's using them?

Iroquois Pliskin:
Look, I'm not exaggerating when I say the success of your mission hinges on how you use that cardboard box. But in the end, a cardboard box is only made of paper. Handle it with care or it won't be of much use to you. Don't think of it as just another box. Treat it with love... Don't be rough. Okay?