Ever wondered how the misunderstandings arise?
Here is a fromula:
You explain someone an apple, he/she understands a lettuce and
thinks of a cucumber.
Even worse when you ask someone to explain an apple to an other
person:
You explain an apple to the first person, he/she understands a
lettuce, thinks of a cucumber and explains a potato to the other
person who understands a tomato and thinks of a durian.
Well, in the end it's not that bad, with a little fantasy a durian
can be similar to an apple 
