well yes I have had that happen. It's like I hear them talking but can't register what they are saying right away.
Is this anything like hearing someone talk and knowing what they said but not being able to respond for a moment?
You are probably feeling a form of derealization, which is neurological in origin and can accompany anxiety.
Basically, if I remember how this happens, its a type of delayed perception where you are seeing something, but yet are delayed in your recognition of whatever it is. Sometimes if you are drunk enough, the same can happen.