You know how when you're in your 20s suddenly it's not socially acceptable to go up to strangers and declare
TODAY IS MY BIRTHDAY.
It's just not really kosher.
Keeping this rule of social acceptance in mind, I did not inform my boss and coworker that my birthday was happening when it was. Maybe it would have been different had I been working at my job for longer than 1.5 months, but at the time, it was still in that "I'm new and can't remember half of what you tell me" phase so to go around like a hyped-up 8-year-old on a bakery frosting diet shouting to the nations that it was the anniversary of my birth was not something I was itching to do.
This Monday: The boss (Dr. L) asks how my weekend was. I go through the somewhat exciting events of the weekend, then joyously inform her that Wayne finally found a long-sought birthday present for me (a fantastic croquet set) and we played croquet like mad for hours on Sunday evening... cue conversation in which Suzanne says silly things:
Suzanne: GAH! I can't believe I just said that! Now she's gonna know it was my birthday recently and that I didn't tell them!
Dr. L: Hey... Was it your birthday recently and you didn't tell us!? When was your birthday?!
Suzanne: (Trying to play it cool but mostly just appearing like she doesn't know when her own birthday is) Oh, um... like... uh...I think in May. Yeah. May. (Really? I think?)
Dr. L: Oh you!! What day?
Suzanne: Uhhh... the 2nd?? Yeah. The 2nd.
Lesson learned. Just be the hyped-up 8-year-old and proclaim your birthday loud and clear. Probably more fun that way, too.