Postcards, historical places and April Fools’ Day

1 April is a joke day in English-speaking countries. People say funny things that are not true, and when the joke is revealed they say “April Fool!” After 12 o’clock we don’t make jokes. We make harmless jokes like: “Your bag is open – a mouse is in it!” — “April Fool!” Rule: a joke must not scare anyone, upset anyone or cause danger. Question: “Is it true?” — “Yes, it is. / No, it isn’t, it’s a joke.”