One time years ago I visited Youtube and for a few minutes I was logged in as a different user (some guy from North Europe). I could look at their Google profil

One time years ago I visited Youtube and for a few minutes I was logged in as a different user (some guy from North Europe). I could look at their Google profile, etc. It was crazy. I don't think I've ever told anyone (how would it come up?) but this reminded me of it.