i think it happen because it was the back bumper isntead of the front. i was at a red light and i just sat there and watch a car hit one of those lincon town car, the town car was black and the second he got hit the bumper just came righ out, it was hit in the corner i saw when it went in and then pop out, was kind of funny but hey no damage. i done 3 front bumpers in 1 yr even hit slow they still broke the bumper. u lucky it wasnt the front.