At a viewing one time, tons of people, and an Amazon delivery showed up. A bunch of boxes. Guy felt weird about it and left them at the door instead of carrying them through the crowd. Minutes later the director comes out and starts yelling about how unprofessional it was to leave them there, then went and asked members of the family to help her carry them to her office.
I had a buddy whose grandfather's funeral was crashed by asshole relatives that brought disposable cameras and started taking pictures like it was a family reunion. Caused an actual physical confrontation. So don't do that.