O'zapft is!

After the Mayor of Munich Thomas Wimmer had opened the "Münchener Elektro-Messe 1950"[2] in the Theresienhöhe district, he made his way to the Schottenhamel tent on the Theresienwiese meadow.

He dedicated the first Maß of beer to Oktoberfest and to the city of Munich,[3] in 1980 the minister-president of Bavaria and the candidate for Chancellor of Germany Franz Josef Strauß started a tradition that the first Maß of beer goes to the current minister-president, continuing to this day.

[4] The legend that the first opening of Oktoberfest in 1950 was spontaneous after Wimmer had missed his carriage and had to be taken to the fest grounds by the innkeeper Michael Schottenhamel[5][6] has been proven false with photographs and newspaper articles.

[3] In 1960 the newly elected mayor Hans-Jochen Vogel deferred the honour of opening the first barrel to his predecessor Wimmer.

In 2018 Reiter forgot to follow the exclamation with "Auf eine friedliche Wiesn".