Three generations of women will plunge 180ft one after another to raise money for charity.
Sophia Pettitt, 16, Maureen Porter, 35, and Jennifer Starkey, 54, all of Wykeham Rise, Chinnor, are going bungee jumping to raise money for The Anthony Nolan Bone Marrow Trust.
Maureen Porter said: "I have always wanted to do it. Sophia thought it would be a good thing to put on her record of achievement and mum followed us."
The trio jump within five minutes of each other, the first at 11.10am on Saturday, May 12. They have already raised £140 in sponsorship and are hoping to raise more before the jump.
Maureen added: "I have not had too much time to think about what I am doing. We are just mad that's why we are doing it."
About 150 people will do a bungee jump during the weekend.
The event takes place on Saturday and Sunday, May 12 and 13, at The Oxford Balloon Fiesta, Cutteslowe Park.
For further information contact the Anthony Bone Marrow Trust on 01865 875577.
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