Mother_in_Law testing Sons-in-law

An old woman has three daughters. One day she decided to test her sons-in-law. She was walking alone at a lakeshore with the first son-in law. Purposefully, she fell in the lake and started yelling for help. The first son-in-law jumped in the lake and dragged her to shore. The very next day he found a brand new Ford Focus in his driveway with the words "Thank you, your mother-in-law loves you very much."

Another day she was walking along the lakeshore with the second son-in-law. Purposefully, she fell down the lake and started yelling for help. The second son-in-law jumped into the water and dragged her to shore. The very next day he found a brand new Pontiac Sunfire in his driveway with the words, "Thank you, your mother-in-law loves you very much."

The third day she was walking with the third son-in-law and repeated the test, but that guy didn't respond to her cries for help and didn't make a single move to save her. The poor old lady who wanted to test her sons-in-law drowned and died. The next day he found a brand new Mercedes convertible in his driveway with the words, "Thank you very much! Your father- in-law."