Loot crate - there is a door on this floor. when you open it you see a sofa where there is some kind of box and it says on top 'Hello, this is loot crate' after that you can understand that this is a loot box. you have a chance to get a grenade and on top it says 'oh they gave me a grenade' after that you explode. There is a second option that may lead you and you can get a red ball and on top it says 'oh they gave me a red ball'. Fun fact: until you open the door the music will not play.