Forget something

I feel really bad, coz I forgot about my dad's birthday. Usually I would be reminded by one of my sisters, but this time no one mentions nothing. When my mom called me last night, she is saying, "dont you forget something?" In my heart, I was like "hell, I must have forgot an important day or something... " Anyway, my dad was "ok" with that. I have to give him some extra gift later~