This article about wedding speeches is useful for those interested about this topic.

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To deliver the perfect wedding speech you should have a good plan. You just can't stand up and start speaking whatever comes up without even thinking. You should take some time couple of days before the wedding and think about what and all you want to say. Think about what you want to say, should say and cannot missed out saying. Jot them down in a piece of paper so that you do not forget. It is even better to write down the whole speech. You can structure your speech by what do you want to say at first and how do you want it to end. 

It is good to practice a couple of times before you go for the finale. This is your best friend's best day so you don't want to blow it. Give your speech a little practice, it is better in front of the mirror. This way it gets recorded in you head and you won't even need to read it out of a scrap of paper. You'll not even forget all the things you intended to say. And with your eyes free to be with audience, you'll just bring out the best of you.

Try not to make jokes on bride, the bride's mother and bride mates. It is advisable to totally avoid even if you were planning to make some jokes and bring about humor in your speech.

Try out the above tips and you have the perfect wedding speech to deliver. You'll just captivate everybody in the audience and your friend will be thanking you till years for the grand speech. You'll turn out to be the life and light of the reception and everybody will be praising you. And why won't they be? After all you are the best man.