Your other side comes out when there is no control.

The theory has been presented of Hyde being the person that Dr. Jeckyll wants to be, and while analyizing the story the idea becomes relatable. Dr. Jeckyll has no control over his actions once he loses control and Mr. Hyde takes over. A situation many can relate to would be the nights we attend "epic parties" and have a little to much to drink. Usually the result is committing actions we would not normally do, causing a sense of embarrassment.  Although they are at times embarrassing to us, but individuals may not see them as embarrassing because they are normal actions they do. We only see them embarrassing because we do not normally act in that manner, another side of us-- typically a side we want to be more like-- comes out when we have no control. Some times the side is a negative side and this usually happens with pint up anger, which may have been the case for Mr. Hyde, yes we know he was not drunk but this could be seen as the same type of side affect. Maybe Mr. Hyde was too nice causing frustration that had negative actions when control was lost.