I made many a batch of NI3. When dry, even water would set it off. I made a batch and didn't have any distilled water to wash it with, so I used tap water. Well it didn't like that tap water at all. It was exploding in the mason jar as I was stirring it. So I poured the whole batch down the sink drain and chased it with hot water. The pipes were thumping for quite a while.
A co-worker stored a batch in a medicine bottle in his freezer, for I don't know how long. One day he took it out and when he went to open it, some exploded and made a mess of him and his kitchen with the iodine stains.