Only if there was someone there that I had already worked with. Actually, though, it normally involved a sort of introduction structured as an interview, in which I would talk to somebody else that I had not worked with before. I did once get re-hired at a place I had already worked, without even that.

It's a bit unusual, but then most interviews are not very good ways of figuring out if the person will work out anyway, so perhaps it's a good sign? Or else they're desperate.