He says he'll 'happily' [='gladly'] postpone the appointment.
They have been 'happily' married for 12 years.
We 'happily' accept credit cards.
(..) Goddamn it, George, swear. Okay. So now you come up. You punch me in the stomach. I'm out for the count, right? And you and Lorraine live happily ever after. You make it sound so easy. I just... I wish I wasn't so scared. There's nothing to be scared of. All it takes is self-confidence. (..)1985 Back to the Future