This is a very funny joke. It took me a while to understand it though.
There was a woman who lived in a condo. Only three other families lived in the condo. Above her was a man and a wife who were about to have a baby. Below was a woman and a man who were engadged. Under everyone was a blind man.
So one day the woman was taking a shower and the door bell rang. She got out of the shower, put on a towel and opened the door. The engadged couple were there they said, " Congratulate us we just got married!" The woman said congratulations and shut the door. She went back in the shower.
A second time the door bell rang. She got out of the shower, put on a towel and opened the door. the about to have a baby couple were there, they said,"Congratulate us we just had a baby!" She congratulated them and slammed the door. She went back in the shower.
A third time the door bell rang. She thought it must be the blind man so she didn't bother with the towel. She opened the door. She was right it was the blind man. The blind man said, "Congratulate me, I can see again!"
If you do not understand I suggest you read the last paragraph over and over untill you understand.