A joke about chatting with an old man.

In a hospital ward, A and B began to discuss their illness as soon as they were free. A asks B: Brother, what happened to your leg? Why is it so serious? B: Hey! The boss invited me to dinner that night and drank too much. When I came back, I drove across a bridge. There is a sign on the bridge, which is too far away to see clearly. I slammed on the accelerator and jumped up. Hey ~ ~ look for it and see it clearly-dig a hole ahead, please go around. As a result, I stepped on the accelerator too hard and got into a sharp turn for no reason! Hey! Dude, what happened to your head? Why is it wrapped so tightly? Then B grabbed A's hand and said, I can find you, so it's your boy. Do you know that I dug a hole under the bridge that night?