More than once now I've been bitten by the: log in, run to the granary, click to remove seeds.., oops, oh no, wait... Yea, mysteriously clicked the Empty button without even doing so... "Poof!" This has happened also just from a bout of bad lag.
You know, I never really liked the feature to begin with. Well as implemented. I mean why not have a confirmation screen or, at least have it drop the items at your feet giving you a few minutes or even 30 seconds to change your mind or recoup from mishaps and mayhems...