It's happened to every woman who's ever worn a skirt or a dress – you sit down, and your undies are visible.
Except for most of us, there aren't a million or so people watching.
Unfortunately for BBC Breakfast presenter Steph McGovern, she happened to wear a frock that offered a pretty clear view of her smalls as she sat on a sofa and read out the day's headlines.
Steph's co-host Charlie Stayt looked visibly uncomfortable at one point as it appeared he realised what was happening.
On the bright side for Steph, at least they were black undies.