How do you know it's his birthday?
I don't remember any such thread and I welcome the initiative but I wonder if this kind of thread is generalised in the section maybe it could turn into a spamfest.The good thing is that most real birthdays won't be known. But you can take the day of registration date as “birthday” in bitcointalk.
May I take this opportunity to congratulate Hhampuz as well.
You can see it on Hhampuz's profile, there is a birthday cake sign which means it's his birthday now.
But I didn't just guess from the profile, I also knew from Hhampuz directly that today he had a birthday and was enjoying his vacation.
Regarding the spam thread, I think this is a discussion about someone having a good reputation as well as having a good time on his birthday.
https://bitcointalk.org/index.php?action=profile;u=881377