I took my Camaro in for various things and one was a random clunking sound that I occasionally heard when I went over speed bumps in the parking garage at work. The sound was more likely to happen when I was going 10-15 mph and turning right while going over a speed bump and the passenger tire was the first to hit.
Anyhow, the tech that checked it out said it was caused by spring insulators (bushings?) not sitting properly (both driver/passenger). They reseated the insulators and lubed the contact points. Guess I'll find out in the morning when I get to work if this resolved the issue or not.