Snake: I'm in a box.
Sigint: A cardboard box? Why are you...?
Snake: I dunno. I was just looking at it and I suddenly got this urge to get inside. No, not just an urge - more than that. It was my destiny to be here; in the box.
Snake: Yeah. And then when I put it on, I suddenly got this feeling of inner peace. I can't put it into words. I feel... safe. Like this is where I was meant to be. Like I'd found the key to true happiness.
Snake: Does any of that make sense?
Sigint: Not even a little.
Snake: You should come inside the box... Then you'll know what I mean.
Sigint: Man, I don't wanna know what you mean! Between you and Para-Medic, is everyone but me that is hooked up with the Major strange!?
Sigint: Yeah, well, anyway, I suppose even that dumbass box might make a decent disguise if you wear it inside a building.
*Looks at cardboard box*
"Just a box"
*Turns back, Snake jumps out and blows away the guard*
Basically, cardboard boxes are the best things a kid could ever have in order to stimulate their imagination.