"I didn't totally forget your b-day. Happy Birthday."
"Forgive me for being being tardy in wishing you a happy birthday. You are still very close to my heart."
"I get absent-minded about certain dates, but I still remembered your birthday--though I'm a little late."
"Belated Happy Birthday!! You rock, I stink."
"Make everyday your birthday, and therefore I'm not late in congratulating you. "
"Belated Birthday Wishes!! I hope you have a great week."
"May you have a great birthday week--not just a great birth day."
"We turn not older with years, but newer every day." -Emily Dickinson
"I got you a pet rock for your birthday. It'll be waiting for you. You'll recognize it."
"The learned man has studied the greatest bday cakes. In life, choose the best slice."
"Belated happy birthday, yes. But no less filled with love."
"Nobody could possibly forget a person such as yourself. Belated happy bday."
"I'm not truly late in wishing you happy bday. I meant to send my wishes the day after."
"True friends never fail to remember your birthday. But they don't necessarily remember it on time."
"To my credit, you were out of the country on your birthday. Can't you remain in a single place?"