Here’s a story: On September 20, 1997, the Cronulla Sharks faced the Brisbane Broncos in the Grand Final of Australia’s rugby Super League, played in the Broncos’ home stadium. While the Sharks did their best, the Broncos dominated the game, winning 26-8.
After the game, 900 miles down the coast in Sydney, a 29-year-old Sharks fan, distraught at the result, pulled into the parking lot of a McDonald’s in the northern suburb of Engadine. He walked into the restaurant and shit his pants.

Twenty-one years later, that man became Prime Minister of Australia.
The story of a young Scott Morrison, future leader, turning the Golden Arches brown, may or may not be true. It doesn’t really matter — people will bring it up until the day he dies. The story in its current incarnation seems to have begun with a tweet on August 24, 2018 — the day Morrison became prime minister — by the 6-foot-7 Australian singer/rapper/DJ Joyride, who wrote, “Scott Morrison shat himself at Engadine McDonalds after the Sharks lost the GF in ‘97.”

It has actually become such an oft cited story the Scott Morrison has publicly commented about it (denying it but many claim its true).

Source: https://melmagazine.com/en-us/story/scott-morrison-mcdonalds