In Anno 1701 unhappy settlers have big lightening bolts over their buildings, grumpy looks on their faces, and possibly burning torches and pitchforks in hand. Like any grumpy child, give them the cookie they've been rioting for and they will fairly immediately forgive you and get back to whatever they were meant to be doing. This simple approach to the games dynamic is one of the key elements that make it so enormously engaging, but can lead to the player punching the screen, after 5 hours of peace and prosperity, as an entire colony sets fire to itself in a fit of pique because the sodding chocolate supply ran out.