A while ago I had approximately 20 double chests of sugar cane. Eventually I traded it all and sick of all the chests I made 10 chest minecarts and used that as a storage system.
Today whilst doing something it started raining and I heard lightning hit something above me. I went up to investigate and somehow the lightning had hit the minecarts, which had 2 hoppers above them and were completely enclosed with blocks, destroying all 10 of them and sending a bucket load of sugar cane everywhere (the carts where approximately 20 blocks above ground).
Of course my inventory was completely full at the time and I managed to lose probably 60% of it.
All this happened 20 blocks from where I got hit by lightning a few weeks back lol.
So, be careful using multiple chest minecarts outside