like a kid in a candy store

very happy and excited about the things around you, and often to react to them in a silly way

e.g. Peter was like a kid in a candy store.

a God-given right

Someone thinks s/he should be allowed to do something even if other people do not like it

e.g. John seems to think he has a God-given right to tell us all what to do.

like taking candy from a baby
very easy

e.g. Beating them was the easiest thing in the world - it was like taking candy from a baby.

honest to God
You say "honest to God" in order to emphasize that you are telling the truth.

e.g. I didn't mean to hurt him, honest to God I didn't!

burn the candle at both ends
to get little sleep or rest because you are busy until late every night and you get up early every morning

e.g. Jenny had been burning the candle at both ends studying for her exams and made herself ill.

a broad church
an organisation that includes many different types of people with different opinions

e.g. The Legco remains a broad church with members from a diversity of backgrounds.

like turkeys voting for (an early) Christmas

People choose to accept a situation which will have very bad results for them.

e.g. Teachers agreeing to even larger class sizes would be like turkeys voting for Christmas.

ring a bell / ring any bell
You think you have heard a word or a name before.

e.g. Does the film 'Notting Hill' ring a bell?

talk turkey
to discuss a problem in a serious way with a real intention to solve it

e.g. If the two sides in the dispute are to meet, they must be prepared to talk turkey.

clear / sound as a bell
in perfect condition

e.g. Grandma's memory is as clear as a bell.

Cambridge Dictionaries Online