Nothing too far out there (and sorry for the iphone picture), but I felt like sharing....
The rim is an Open Pro (though this post is absolutely not a dig on Mavic!) on a rear wheel. The dark line through the braking surface is a crack- above the crack, the rim is bulging out.
It started six months ago or so, loaded with weight on a bike tour, when my tire flatted out, and I hit a pothole. This caused the rim to bend inward very slightly right at the impact. I carefully bent the rim back into shape with a crescent wrench, but it was never like new again. The hit also put a slight flat spot in the wheel, and spoke tension has been a constant-but-manageable issue.
~3000 miles later, I've got this crack.
Luckily, I've already got the parts for my new wheelset, and a spare bike as well, so no worries