Accidentally Attacking a Base
It's all happened to us before. Your clicking next and going through bases and when you click next again, you accidentally drop a troop and start raiding that base. Some people just surrender and loose their trophies and some people take their chances to attack and most likely just loose their trophies.
So my idea is that supercell should add a button so that if you drop a troop you could surrender without loosing any trophies. You would need to have 0% on the base to surrender without loosing trophies, this would prevent any ♥♥♥♥♥ing.