That moment you realize you have excess loot and all your builders are busy for days
It is probally not bad after the first time since you will get used to it, but the first time you realize you'll get raided soon as you log off.
But then obsictales start growing; you see them in the way and have no way to remove them and there's a half full gold storage and elixir storage sitting there along with a quarter filled dark elixir storage.
And the lab is also researching.
Always sucks when that happens.