We had some amazing electrical storms in Perth not too long ago which produced some pretty amazing sights. This long exposure captured a couple of strikes landing almost next to each other. If you look closely in the sky on the right hand side you'll also see some smaller bolts going across the clouds.
Canon 5d mkiii, Canon 24-105mm, f/8, ISO100, exposure 20sec.
This is an amazing photo. I have never tried to capture lightning, but now I have a new motivation.