How about any photograph made where the plane of focus is not parallel with the film plane?
(Ahh... I see Mark beat me to it.)
How about any first-generation contact print larger than medium format?
How about any practical photograph made with an antique brass lens from the 1800s?
How about any photograph where the camera is not level, but all verticals in the picture are truly vertical. (And you didn't have to spend a gazillion dollars on a specialty PC lens?)
Like this one, where the camera was actually pointing slightly upward, yet there is no vertical convergence.