An old woman had 3 daughters.

One day she decided to test her 3 sons-in-law.

One fine day, she was walking along a lake shore with the 1st son-in-law.

Purposefully, she fell down in the lake and started yelling for help.

The 1st son-in-law jumped into the water and dragged her out into the shore.

The next day he found a brand new car in his door steps with the wording, "Thank you! Your Mother-in-law who loves you very much!!"

Another day she went out with her 2nd son-in-law. Purposefully, she fell in the lake and started yelling for help.

The 2nd son-in-law, too, jumped into the water and dragged her out, onto the shore.

The next day he found a brand new car at his doorstep with the wording, "Thank you! Your Mother-in-law who loves you very much!!"

The third time she was walking with the 3rd son-in-law and she repeated the same.

But that guy got scared and ran away without offering any help to her. The poor old lady who wanted to test her sons-in-law drowned and died.

The next day the third son-in-law was surprised to see a new brand new BMW waiting at his doorsteps with the following wording,

"Thank you very much! Your Father-in-law!"