A woman was sitting at the breakfast table reading a letter, when she suddenly looked up suspiciously at her husband.
"My mother says that she won't be coming to visit us this year," she said. "She says that she doesn't feel we really want her to come. What do you suppose she means by that? I told you to write and say that she was to come at her own convenience. You did write, didn't you?"
"Ummm, yes, I did," replied the husband. "But, er, I was having trouble spelling 'convenience', so I made it 'risk'."