... you realise your disk wasn't attached and you ran all the way back to the refinery anyway.
... you realise the comps you were gathering were the wrong ones. And you gathered 20.
... you think you're finally finished with a armor or scale set only to realise you missed one thing that is halfway across the map.
... you return to your crafting after a period of AFKness only to realise your silo is completely empty
... or you accidentally delete your epic essence: