During the filming of Harry Potter And The Half Blood Prince, Helena Bonham Carter wet herself during a battle scene!
Shortly after giving birth to baby girl Nell, and Tim Burton's wife quickly discovered screaming and water retention do not go together for new mothers.
The Bellatrix player had this to say about it:
I did a wee wee. I was barely able to stand up, let alone jump around, screaming. Anybody who has had a baby (knows) if you scream, it's Niagara (Falls). I did 25 takes and I just thought, 'You have no idea what's going on down there.'
Sorry to hear that, Helena.
No, really. We didn't want to hear that!
[Image via WENN.]