Assuming the goal is "Get through security without losing your laptop or your data" I would say the following are terrible ideas:

"Prank them with an undecryptable random file" https://news.ycombinator.com/item?id=19834934 and "prank them with 20,000 goatse images" https://news.ycombinator.com/item?id=19837896 as they can get you back by seizing your electronics. Of course, those sound like jokes not serious suggestions.

"Have it remotely locked by an administrator" https://news.ycombinator.com/item?id=19835097 as they won't understand that technical mumbo-jumbo and will just seize the laptop.

"Have a hidden dual-boot system" https://news.ycombinator.com/item?id=19836135 as if they take a disk image and spot it, they'll be particularly suspicious of you.

Some posters also think "Send your encrypted laptop by mail" https://news.ycombinator.com/item?id=19835019 is not good advice.