httpv://www.youtube.com/watch?v=XMQiNNQdih8
JFK tree planting (@ 1:39)

(Tuesday, May 16, 1961) — U.S. President John F. Kennedy, having just arrived for a state visit in Ottawa, Canada, badly strained his injured back tonight during a tree planting ceremony on the lawn of Government House. It couldn’t have happened at a worse time. He would be dependent on massive injections of painkillers as he faced Soviet Premier Nikita Khrushchev in Vienna next month.