Not everyone in Canada opposing the Vietnam War remained quiet.

Beatle John Lennon and his wife Yoko Ono staged a “bed-in” protest in 1969 Montreal. They gave press conferences from their hotel room bed speaking out against war. During the event, John and Yoko recorded the still-heard Happy Xmas (War Is Over), inviting random hotel room visitors to sing on the recording.

Here are the peace posters and billboards they unveiled around the world: