I'm going to laugh during communion
What would make you laugh during communion?
Conversation is the greatest form of education. For instance, I will laugh about the word "communion"
A religious ceremony is sacred and should be taken very seriously. It's very rude to want to disrupt a ceremony going on. You should show respect.
I can do whatever I want, so shut up and sit down
You might think you can do whatever you want but I wouldn't be surprised if people attending mass become upset with you. It's selfish to ruin their spiritual time of the day just to entertain yourself. Maybe you can find some other hobby to keep you entertained instead?