Typically April the 1st.
What about gender neutral traffic-lights, Why are only men depicted on them? (we need red and green women too).
Or Tivoli(Amusement park) opens a new attraction only for dogs.
Or Bamse og kylling (It's a children's program named Bear and Chicken) makes a combat, But now with real live animals after request from parents. (I think they might have to replace Chicken quite often)
Any good Australien ones?