My rear windshield glass shattered with no external impact traveling at 15 mph on a side street. The sound was very shocking and distracting. It sounded like a gunshot struck our vehicle. All the glass shattered and broke for no apparent reason. We had a pet in the back seat and were very distressed from this incident. I had to tape up the rear window with a garbage bag and duct tape in order to drive the vehicle, prevent glass from falling on the road behind me, rain damage, which then left me with no visibility and safety issue. No one was harmed fortunately but we had to then have window replaced/repaired by Safelite who advised us to look for a recall as they felt it was unusual and not common. When we notified Acura there was no recall for this issue. There were no warnings or messages prior to this failure. It was a shocking sudden experience! Now we have glass remnants that rattle within the back panel as they couldnt fully be removed due to the construction of the vehicle. My vehicle is available for inspection if requested. I also have photos of the damage when it happened.