You have a painting with a string attached to it. The string is attached to the upper two corners of the painting. In the wall, there are two nails, horizontally next to each other. The string must be hung on the nails in such a way that the painting falls down if any of the two nails is pulled out of the wall. The painting must hang under the nails and must hang on the string.

The question: How must the painting be hung?

The answer: Click here!