Swimming and the fuss

Lucas had a water play in school today. So, yesterday I packed all his things and told him he is going to swim with his friends. He was all excited until we were in the school this morning. When we arrived at his school, his friends were all changed and ready to go to the pool. I tried to change him but he made such a big fuss! He refused to wear his swimming trunk nor swimming diaper. He kept crying and insisted that he wants to wear his school uniform. After half an hour commotion, he finally wore the swimming diapers and then his uniform over the diaper! He hasn't been to the pool since we moved here. Swimming pool is 5 mins drive away and no longer a lift ride. On top of that, we have to pack all his gears and clothes to change - a bit too cumbersome and also we are getting lazy. Looks like we cannot afford to be lazy now, else he will avoid the water completely. But then, the teacher said he was ok when they went to the pool. He agreed to wear this swimming trunk and enjoyed the water play. That is a relief!
When get home from school, another commotion took place. I gave him the choice of eating sandwich or rice for lunch. He took the sandwich and threw it on the floor. I said fine, you are eating rice then. He sat for 20 mins and only had 2 spoons of rice. I left him in his high chair and walked away. I told him to call me when he is done with his lunch. He took his plate and threw the rice on the floor. That was the last straw that break the camel's back. I locked him inside the bathroom for a few minutes. He wailed of course, then he pee-d on his pants. I changed him and put him on his bed. Threatened to lock him inside his room if he dares to get off his bed. He asked for water and I refused to budge him. Told him he has to sleep hungry today. He felt asleep within 5 mins.
Sigh....what a day. Wonder all these will teach him a lesson or will make him more determine to be more rebellious.