Re: Went for a coffee - stayed two weeks
I'll add, never give your passport away to anyone, full stop. You can allow them to inspect it, and many nations make this easier (France and UK have transparent booths so you can see they aren't doing anything funny).
Many many stories of them being stolen. A stolen kiwi passport is worth $10-50k on the black market, so if you leave yours to rent a motorbike in Laos, don't be shocked if you come back and the guy claims some other white dude took it.
Don't sell it either. Knew one of chap who tried that, when Internal Affairs (NZ home office or state department) got wind of that they got his residence revoked, got him deported from Oz when he went there and locked him up for about the same amount of time as killing someone.
It's government property, and you can refuse to give it up to anyone other than the issuing authority.
"Holding on to your passport for safe keeping" is what gang masters do.
If you can get dual passports or dual citizenship if you travel a lot, having a second option is always nice.