I remember last year, I was on california screamin' at california adventure.
We got to the launch nect to the water, waited, and nothing happened, waited some more, nothing. Eventually we we away and enjoying our ride. It was a very strange experience..
The last coaster I rode was the Desert Storm at Castle's N' Coasters, that was in october, the last few times I've been there it was closed for "preventive maintenence."
(sorry, couldn't find many good pics, look on the site here, they are pretty good)
ADMIN EDIT: I found one for you!