In 1969 the national TV news broadcast in the Netherlands reported that inspectors would be driving through the streets to catch people who hadn't paid their license fee. "Surely people won't be wrapping their tvs in aluminium foil. So we'll catch them!" Aluminium foil was sold out the next day. The date was april 1st.

https://nl.wikipedia.org/wiki/1_aprilgrap#Jaren_60