Our happy hour fact to amaze your drinking buddies with.

Driving a convertible with its top down at high speeds could lead to permanent hearing damage.

Researchers from the St. Louis University School of Medicine tested the decibel levels in the interior of four popular models of convertibles at different speeds. They found that at 55 mph the noise level was equivalent to a construction site, and at 75 mph the equivalent of a nearing jet.

This shouldn't pose much of a problem on shorter trips, but the study suggests driving a convertible over 50 mph for long periods of time of could contribute to permanent hearing damage.

Other risks associated with convertibles: bird droppings, hat loss, the odd decapitation.