A laugh a day

A woman tells her husband that she is ill and gonna die soon. The husband is shocked and starts crying.
But, the wife continues and tells him that according to the doctor there is one last chance to get rid of the disease and to survive.
Really says the husband, what is it? We need to have anal sex answers the wife. You will recover after having anal sex asks the husband? This is ridiculous. Anyway to potentially help his wife they practice anal sex that night.
The next morning he wakes up and his wife is not in bed. He is concerned and starts looking for her in the house and finds her in the kitchen singing cheerfully. She hugs him and says: You won‘t believe it, but I felt great this morning and went to the hospital. They made some tests and told me that I am completely cured.
The husband starts crying. The wife is touched and asks him why he is crying?
The husband answers: I could have saved mum too.