Change your birthdate in facebook to a random date.
It works easier if u change it to an upcoming date (say, next week).
When "the day" comes, see how may people wish u birthday.
Surpriseeee~!! Yeah.. No one remembers your birthdate.
Well theres some, ur parents (hopefully), ur siblings (maybe), some really close friends (theres maybe here still :p )
Its fun tho. Hehehe.
How do i know?
Cos I did this.HAHAHHAHA