“If you have someone that you think is The One, don’t just sort of think in your ordinary mind, ‘OK, let’s pick a date. Let’s make a party, and get married.’
It’s not usually a nightmare, but it can certainly be an American traveler’s bad dream: clearing immigration at the airport when returning to the US.
Plan as you might, whether between cities, countries, or continents, transit days are tiring and stressful. Some trips are harder than others of course, but in foreign countries almost all trips are demanding.