A mother-in-law doesn't trust her sons-in-law...

...so she decides to test them.

First, she goes to the oldest's house. She jumps into a well, but her son-in-law rescues her promptly. The next morning, the oldest son-in-law finds a brand new Suzuki in front of his house with a little note: "Lots of love, your mother-in-law".

The next day, she goes to her second son-in-law's house. She jumps into a well once again. Her son-in-law rescues her, but only after pondering about the decision for a while. The next morning, the second son-in-law finds a second-hand Trabant in front of his house with a little note: "Love, your mother-in-law".

Finally, the next day she goes to see her third son-in-law. She jumps into a well, but the youngest son-in-law doesn't rescue her, so she drowns and dies. The next morning, the youngest son-in-law finds a splendind new Porsche in front of his house with a little note: "Thank you. Your loving father-in-law".