The Donkey in The Lion's Skin

A donkey disguised itself by dressing up as a lion and then went around spreading terror amongst the other animals. Some time later, when it encountered a fox, the donkey roared as fiercely as it could, but the fox just burst out laughing. 'If I hadn't heard you braying, I might also have been scared by that lion's skin.' There are a lot of stupid people, who, like the donkey would like to dress up in fine clothes and pretend they are important, but they betray themselves.