Activated and jumped through the End portal I'd discovered a few days ago. The spawn platform in the End was .. mostly safe. Or at least that's how it seemed at first, covered on 3 sides and the top and open to the void on just one side. I'd put all my gear in an ender chest to avoid zenloss so I put the chest down and was pulling stuff out and formulating a plan when the dragon discovered the one side of the platform that was open and fired off a breath attack. The breath blew up the just-placed chest and left me sitting in a puddle of dragon breath that completely covered the platform, underground, without weapons, without armor.. I hadn't even got my pick out yet. One of those, "well that escalated quickly" kind of situations.
I should have at least come through the portal with a handful of bottles. There wasn't much room on the platform but I did manage to avoid the initial blast. If I'd had some bottles to suck up the dragon's breath then I might have been able to clear the blocks of the dragon's breath that I was standing in and at least survived the first attack. I'd still have been underground in the End without weapons or armor tho. Fortunately I hadn't managed to pull out anything valuable when the dragon attacked. I thought I was pretty safe and was kind of taking my time formulating a plan of action when <splat>.