I think that the worse rule is that two babies who are born identical twins cannot both live.  This is the most horrifying of the rules to me.  They have to weigh both babies and kill the smaller one.  How arbitrary.  This, of course, is that rule that leads both Jonas and the reader to realize the dark side of the Community.

The rules of the society of Lois Lowry's The Giver are ridiculous, or preposterous, if one considers what it means to be fully human. In this futuristic society, the rules are made much as they are in the New World of Brave New World, for the purpose of control and social order.  However, these regulations deny the humanity of the people by taking away the natural hormonal urges to love and to delight in the opposite sex; people are further dehumanized by the lack of freedom of choice as their careers in life are assigned to them. Above all else, their freedom of thought is denied.

Personally, I don't think the rules are ridiculous.  They may be oppressive and inhuman, but they are not ridiculous.  All of the rules serve a definite purpose in their society.  They all help to ensure that the society will experience sameness and stability.  The rules are over the top for sure, but so is the idea of a society that has such complete conformity.