As far as any language is concerned, your opinion doesn't matter. And I have no idea why, either. Mostly everything about French is whacked out in some way, as well as with English, so I wouldn't expect anything to make sense*.
*Except apostrophes. There are concrete rules regarding apostrophes.
Often, literally, a pillow fight but may include similar situations like volleyball, particularly when wardrobe is skimpy and the action is bouncy.