The joy of having two 3 year olds

Ok, can someone please tell me how to deal with sassy 3 year olds. I can't believe the attitude that 3 year olds can have. It amazes me that children so small can be so sassy. Now usually I can reason with them and they are very well behaved, but I think that they have learned to try to reason with me. I told Jay and Logan that they couldn't go to the duck pond unless they picked up their toys and help me pick up their room. Jay looked at me with his big blue eyes and said, Fine I don't want to go to the duck Pond and walked out. I couldn't believe it. I thought that if I threatened to take something away that they would listen, not turn on me. Soap has become the new thing in our house. I had always heard how much twins would team up with each other, but I guess I never thought that my boys would ( yeah, how naive can I be) They really think that they can get away with things if they team up. They have learned how to whisper in each others ears. It is very sweet and so cute to see how close they are, but sometimes I know I am in trouble when I see those two little heads together and the wheels turning. Now I love being a mother and especially a mother of twins, but please I know that some of you have to have some advice for me.