There are some good videos out there illustrating all aspects of the role of prayer in a believer’s life. Media Fuel just released a new one called Coffee with Jesus. It looks at how we tend to use prayer as a checklist of what we want and need instead of developing a relationship with Him that includes listening to him and being still before Him. If you are teaching on prayer this video would be a good set-up and it comes in at a good length around 2 minutes.