A man is walking past this house when a used condom comes 
flying out of the second story window and lands squarely on his 
head. Rather disgusted and absolutely furious, he goes up to 
the front door and starts pounding on it. 

An elderly man opens it and asks him what caused him to 
knock so loudly.

The passerby asks, "Who's in your upstairs room?"

The elderly man replies, "I can't see how it's any of your 
business. Since, you must know, my daughter and intended 
son-in-law are upstairs."

The passerby hands him the used condom and says, "Well, I 
just wanted you to know that your intended grandchild fell out 
the window!"