According to German law, a pillow is considered to be a weapon. For this reason, if you hit someone with a pillow, you have technically assaulted them, which could result in arrest. To be more specific, pillows are a form of passive weapon used to shield or protect oneself from harm. We aren’t quite sure how popular pillow fights are anymore, but one thing is for sure: If you’re ever in Germany, be careful not to whack anyone over the head with your pillow, especially if there are police nearby.
We aren't sure who came up with the idea that pillows are considered as a weapon, but they must have had a big thing against the creature comforts of life.