9. Borrowing A Name - Pirates Of The Caribbean: The Curse Of The Black Pearl
When pirates launch an attack on Port Royal, it makes sense that they'd head straight for the largest, most expensive house in search of a little plunder, and, being the Governor's daughter, it makes sense that Elizabeth Swann would hide from those pirates.
While the pirates were actually drawn by the Aztec coin she possessed, for all Swann knew, they were simply there to commit a little piracy and make some money. So, upon being discovered, the smartest thing to do would have been to use her father's wealth and power as a bargaining tool, securing her own safety by virtue of her worth.
Instead, she pretended to be a nobody, borrowing the name of the local blacksmith in order to pose as one of the household staff - a pretty stupid move, considering pirates were known for their penchant for murder (amongst other, worse things that could befall a young woman).
Luckily, using the name Turner bought her some time before being slaughtered by the pirates, but having just seen one of her staff killed in front of her, it seems that pretending to be no-one was a pretty stupid thing to do.