There was an era in my teaching life when, to destress, my colleagues and I frequently played nerf guns. We shot each other in the staff room and sometimes even outside the staff room. Sometimes innocent bystanders were accidentally shot as "collateral damage".
A senior colleague advised us to be more restrained in our nerf warfare. We cheerfully ignored his counsel. A HOD even brought a nerf machine gun!
I once played both sides. I encouraged a group of nerf gun trigger-happy colleagues to ambush a colleague.
They agreed. As we were approaching the colleague (in the staff room), I texted him to tell him we were coming. So when we burst in, he was ready with his weapon! A shoot out ensued!
One evening during another nerf gun war in the staff room, the principal himself suddenly walked in. It was very, very rare for the principal to visit the staff room and I knew that he was walking towards an ambush. I could not warn the ambusher!
The principal walked into the aisle and was shot by my colleague, who was horrified. The school leader did not scold us. He picked up the nerf bullet that hit him and returned it to my mortified colleague.
The sight of MOE teachers going around the school playing nerf guns (sometimes in full view of the students) like some 上海滩 gang war movie is hard to imagine for those who were not there. But those who were there will know what I mean.
I strongly doubt this can happen in any school in this era.
Maybe to improve the mental health of teachers, schools can organise nerf battles where colleagues can form platoons to take out other platoons!