This desynchronization problem happens when a player clicks stack of items (in this case from the player's inventory) to move them and then pushes CTRL.
Tested for multiple items and for both host and guest. Reproduceable (tested 4 times).

I remember this being a bug report, not a discussion about the usefulness of certain items.

Multiple Personal Laser Defenses equipped "explode" the speakers/headphone.
They all shoot at the same time, thus cause the sound effects to overlap with each other and get extremely loud. 7 Lasers shooting transform my room into a techno disco. ;) But seriously, it gets uncomfortably loud and needs ...