The final straw appears to have been his comments comparing the vaccination programme to the Holocaust.

Source: https://theconversation.com/andrew-bridgen-how-anti-vaccine-misinformation-hampers-the-conversation-about-genuine-vaccine-injuries-197351

The final straw came less than one year into the program, when she became pregnant.

Source: https://www.huffpost.com/entry/mongolia-displaced-nomads-city-heartbreak_n_65835f7ce4b04da9842599d6

The final straw proved to be the claimed reason for Ms Boorne's anger.

Source: https://www.liverpoolecho.co.uk/news/liverpool-news/killers-brazen-lies-exposed-plant-27343168

The final straw, she says, was getting into a screaming argument with a stranger in Tesco.

Source: https://www.theguardian.com/lifeandstyle/2023/mar/04/lift-the-lid-and-theres-a-well-of-rage-why-women-are-mad-as-hell-and-not-afraid-to-show-it