In the comments of a recent answer, which had mentioned the detention of hikers by Iran, one of the people referred to "border surfing". What is border surfing?
Edit: I'd rather not have to link to the discussion in question, but it's not about water surfing: What to use instead of credit cards in Iran?
getting arrested while on the other side of the border would be an Iranian idiosyncrasy, wouldn't it?
Not really. This could have happened during a border surf between other countries as well.