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"When in Rome, do as the Romans do" is decent life advice. It's slightly less reliable security advice.
Here are some culture shocks that surprise even well-travelled people as well as a security awareness lesson in disguise.
1. Greetings
In Japan, the bow does a lot of the same work a handshake does elsewhere — except it also sets a tone of formality and distance that a Western handshake doesn't quite carry. Miss that, and you can come across as far more familiar with a stranger than you meant to.
Security lesson: Reading a greeting wrong is harmless. Reading trust and distance wrong isn't — pay as much attention to the tone being set as the words being said.
2. Trust with belongings
n Japan, it's entirely normal to leave a laptop bag on a train seat or café table to hold your spot, wander off to order, and come back to find it untouched. In the Nordics, prams with sleeping babies get left outside cafés while parents eat lunch inside — nobody blinks. Both are lovely examples of a place running on a higher baseline of trust than most.
Security lesson: The level of trust that feels normal at home doesn't automatically apply anywhere else — worth resetting that assumption every time you land somewhere new
3. Queuing and rule-following
The tidy, one-behind-the-other queue isn't universal — plenty of places treat it as more of a shared idea than a formation. Germany sits at the other extreme: pedestrians will wait for the green man at an empty junction at 3am with zero cars in sight. The rule gets followed simply because it's the rule. Worth remembering next time you're wondering why a process gets followed to the letter somewhere — or why it doesn't.
Security lesson: Following a rule out of habit, even when it makes no sense in the moment, is exactly how people talk themselves past a process that should've been questioned.
4. Cash and payment habits
Contactless has made plenty of us complacent about carrying cash — right up until we're somewhere that still runs largely on it, which means a fatter wallet than usual. China's the opposite extreme: literally everything runs on a QR code, paying, ordering, entering a building, even getting loo roll from a dispenser. Life is scan-first there. A hard habit to switch off the moment you're somewhere telling everyone not to scan random QR codes.
Saying that,contactless has made a lot of us complacent about carrying money. But there are plenty of destinations still run largely on cash — which means turning up with a fatter wallet than usual, which means being a slightly more interesting target than usual. Old advice, still true: split it up, don't flash it, don't need all of it in one pocket.
Security lesson: The instinct to do "whatever's normal here" is strong — which is precisely why it's worth pausing before scanning, tapping, or handing over anything without checking who's actually on the other end.
5. Business and hospitality rituals
In Japan, business cards are exchanged two-handed and studied properly, never pocketed straight away — a small ceremony that's really about signalling respect. In the Gulf states, refusing the tea or coffee your host offers can land as a genuine insult; rapport comes first, the actual ask comes later, sometimes much later.
Security lesson: Rapport-building is usually genuine. But it's also the first move in almost every con going — the tea always comes before the ask.
6. Attitudes to authority
Some cultures instil a strong "don't question the uniform, the clipboard, the lanyard" instinct — useful, respectful, generally sensible. In several countries, a small "tea money" payment to an official is treated as completely unremarkable admin friction rather than corruption — properly disorienting for anyone used to zero grey area, and worth having thought about before you're the one deciding whether to play along.
Security lesson: Respecting a uniform and verifying it aren't opposites. It's fine — sensible, even — to do both.
None of this is really about "doing as the Romans do." It's about knowing enough to notice when something's slightly off, wherever you happen to be standing.
