When did you decide what specialty?

For current med students/residents/docs. At what point did you decide which type of residency you wanted to match to? I've never really thought about anything other than primary care but with seeing all these threads on specialties I'm interested to hear about this. Do a lot of people intending on primary care end up switching during med school? Or is that usually just people interested in a specific specialty?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums