Similar thing happened to me once. I was riding along the Burke-Gilman trail in Seattle, in a storm, and a 3-inch branch fell on my handlebars and bounced off in front of me. I squeaked loudly and then, bumpety bump, rode over the branch.

I made it home, where my hands were so numb that it took me five minutes to undo the zipper on the back of my coat to extract my keys.