John Lennon and Yoko Ono stayed in Aalborg in Denmark over the new year and most of January 1970, to be with Ono's daughter Kyoko. She was living there with Tony Cox, Ono's second husband, and his new wife Melinde.
While staying in Denmark Lennon made the decision to have his hair cropped shorter than at any other time in his adult life. The precise reasons are unclear, although he and Ono were in the midst of a lengthy peace campaign and were keen to remain in the public eye.
Lennon and Ono both had their hair cut on this day. It was later described by the Daily Mirror as "the most sensational scalpings since the Red Indians went out of business". The couple kept their shorn locks in a bag for future use.
On 4 February 1970 Lennon and Ono swapped the hair for a pair of Muhammad Ali's bloodstained boxing shorts, which they said they intended to auction to raise money for peace.