Bowing

You would not believe how much Koreans bow...it's amazing.  Every time you enter a business, you bow and say "yo-bo-say-yo" or something like that, and they bow and say the same thing.  And when you make a purchase/pay for your meal, the cashier usually bows to you, and I'm assuming you're supposed to bow back.  Then when you leave, you do the yo-bo-say-yo bow exchange thing again.  This applies everywhere, even the 7-11 on my street.  So every time I enter it to get a snack, I have to go through this whole process of bowing and greeting in the most American of institutions just to get an ice cream bar late at night.  A bit annoying at times, but usually I just find it funny.