Tips on how to open and close presentations?

What is the most important part of any presentation: the opening few seconds. This is the time you will either grab the attention of your audience or turn them off so they pick up their phones and start checking their mail. Here are some excellent tips on how the open and close a great presentation.

And by the way the bit in the middle is like the filling in a sandwich its up to you to make it as edible and interesting packed full of juicy bits as it can be!