My nether lava is glitchy. For some reason, it stops working, but if I go to visit it in the nether, it's working again.
So I get to the nether, check my jetpack. Only 5000 EU left. So I put it in my ender pouch, where I have it hooked up to a charging station. I begin my long walk to the nether lava pump. I get there and I check my ender pouch, take out my fully charged jetpack. Then I wander around my pump, checking connections, checking the engines etc. Then I fall down a hole I made last time I was in the nether. I drop like a rock. I immediately hit space and M to get out of hover mode. Then I realize that I never put my jetpack back on!
I'm already in the lava by now and put it on. But it's too late and I drown in the lava. What makes it epically bad for me was that I was carrying a boatload of expensive stuff: Enchanted Nano armor, jetpack, lappack, portal gun, two advanced diamond drills (one with fortune, one with silk touch), an advanced chainsaw.
I'm in the late game now, so it's not really that bad as far as materials. But it's bad as far as time--it took me an hour after I respawned to get all my gear back . . . And I still haven't got a new portal gun because of an epic fail in fighting the wither. At least this time, he's 5000 blocks from my base, so I'm just gonna leave him there.