If you, or another play is standing on, or in the way of a shulker box while you try to open it, minecraft will crash almost every single time. Not freeze, or lag, 100% crash. 

Also, whenever another player enters the end world, any chest you have placed near you will break, and the drops will fall, BUT if you have a shulker placed in the end, and someone else enters the end THE SHULKER WILL STRAIGHT UP VANISH AND ALL YOUR STUFF WILL BE GONE.