Prosecutor Neil King told the court Ashley Gill-Webb threw a bottle in the hushed stadium just as the race was about to get under way:
He threw a green Heineken bottle in a lobbing motion that was captured on CCTV.
This bottle landed extremely close to the athletes and it's probably luck rather than Mr Gill-Webb's judgment that it did not do anything far more serious.
More top news
A 25-year-old man has been arrested for urinating on the Cenotaph in Whitehall and pulling down commemorative wreaths.
As many as 60 bands in beautiful costumes are taking part in the grand finale of the Notting Hill Carnival parade today.
Smoke was seen for miles around today after a Wetherspoon pub caught fire in south east London.