The Forgotten Birthday

Damn it, damn it, damn it! Know what? I forgot my Dad's birthday! It was yesterday! You know how I found out about it? My Dad called me last night! He's like asking me if I remember anything and right at that time, there was like a lightning strikes right into my head and not even half a second I manage to say "It's your birthday..." . So sudden. Really. And he murmured that none of his children, his biological children called to wish him! All his stepchilds did. I mean, I really forgot. It's not like I intentionally did it. Feeling guilty, I called him back, saying that I couldn't talk longer when he called me because my friends were around(we were having dinner at this stall at that time).