Humour is a human privilege. There are examples of fun, games and amusement in the animal kingdom, but the generation of deliberately funny things is a peculiarity of homo sapiens. A giraffe doesn't bother to trick a lion or make his mates laugh, but even a meerkat can't laugh at his neighbour falling down. We can. Humour is a gift to humans, it amuses us and often releases tension. Its source is mostly our own stupidity and weakness, whether we look at the individual or at humanity.