I hate it when I really work on a presentation and practice the delivery, then something goes wrong. Something like a technology issue or an...

I hate it when I really work on a presentation and practice the delivery, then something goes wrong. Something like a technology issue or an interruption in my presentation. What tips do you have for someone in order for them to be prepared for something going wrong with their presentation? What are some things you can do to improve your presentation skills? Provide some examples.