Point your camera directly at the sun and take a photo. Include some interesting subject matter if you like. Perhaps try for a nice silhouette.
If there are any quirks in your optics that you have not yet discovered, you will now.
I took a number of shots at ground level looking up through the grass into the sun. Of course I did not look directly at the sun, I just held the camera and pressed the shutter. The previews looked fine on the camera but when I got to the big screen I had hazy white dots, ghostly arcs and a funny rainbow arc out near the periphery that might have circled the entire image if it were not for the dark ground.
So now my next project will be to work out what causes these effects and what I can do to either get rid of them or make them work for me in future shots like these.
Photo: Robert Rath, '366 Days of 2012, Day 73 - Day's End'. 1/400 sec at 24mm f/22, ISO 400