She laughed after hearing this joke:
 
One day two friends, visiting the center of Paris, realize that crocodile shoes have become the fashion of the moment, so one says to the other:
 
~~“Let’s get together and open a crocodile shoe shop in Italy. We could get rich!”  
And the other answers:
 
~~“But we have no crocodiles!”
 
~~“Do not worry! Let’s go to Africa and catch some of them!”
 
The two friends leave for Africa.
 
They arrive in front of a river, and they see a huge crocodile. They go after him and after more than an hour of fighting they manage to capture him.
 
After observing it well, one of the two friends says:
 
~~“We made all this effort for nothing!”
 
And the other:
 
~~“Why?!”
 
~~“He has no shoes!”