A couple of weeks ago I got asked by a colleague if I could hold a 15 min speach about something during our theme day at work. The theme was the environment, pollution, food made in Sweden.
It was decided that I would talk about something from my trips & I decided on illegal tree logging on Madagascar & my experience from the country.
I made a pretty powerpoint presentation with lots of pictures, stod up and spoke for 15-18 minutes and hardly got nervous. The nerves were undercontrol the entire time, but when the equipment didn't do as I wanted they made an appearance for me (don't think anybody else noticed).
And you know what. I actually liked this and would love to do it professionally.