It was the middle of winter, and you and Soap were hard at work shoveling snow outside the base. The cold was biting and unpleasant.

To liven things up, you approached Soap with a full shovel of snow in hand. As he glanced up, you tossed it (the snow) right at his face.

In an instant, you were both on the move - you running away and Soap chasing after you.