One of the moments of the Olympic Games so far came in the Velodrome as Team GB's women celebrated their gold in the team pursuit.
The team of Jo Rowsell, Laura Trott and Dani King blew the field away, setting three world records in their three races to sweep to victory.
That made it four gold medals in the Velodrome already for Team GB, and with Sir Paul McCartney in attendance, the delighted crowd broke into song.
Just as he had done in the Olympic opening ceremony, which he performed for a nominal fee of £1, the former Beatle led the crowd in a rendition of Hey Jude.
Everyone in the crowd joined in the euphoria, making the sing-a-long considerably more jubilant than the last occasion we can recall a singer reeling off one of his hits in impromptu fashion at a sporting event — Cliff Richard's famous effort in the Wimbledon rain in 1996.
Have your say: Was Sir Paul McCartney's impromptu singalong one of the magic moments of the London 2012 Olympics, just a bit cheesy, or a bit of both?