It's always nice to surprise someone for their birthday.
Sergio is waiting at his home for a friend who he invited over because it was their birthday.
Sergio wants to celebrate his friend's birthday.
Sergio reveals to his friend an elaborate set of events and activities the pair will be doing to celebrate the birthday.
Sergio entertains is friend exactly as if it were any other day and while they have fun, it is nothing out of the ordinary.
Sergio's friend enjoys the unexpected fun and has a happy birthday.
Sergio's friend enjoys the visit but is a little let down they didn't do anything special for his birthday.