I have been experiencing different kind of problems on Stack Overflow and I had posted a question on meta here. But the experts could not reproduce the problem, neither could I. Today, when I opened Stack Overflow it was showing me Tassadaque's profile instead of mine (me and Tassadaque are on the same lan sharing single public IP address). When I clicked on his name to go to his profile, Stack Overflow showed me following page
You can see that on the top bar it's showing my name (Muhammad Adeel Zahid), but in the details section it is showing the credentials of Tassadaque. This clearly is absurd, and it happens to me frequently. This could be the default authentication cookie of ASP.NET MVC!
Edit OK, this is the correct behavior if I view Tassadaque's profile after logging in. Now, I just closed all Stack Overflow tabs in my browser and in the new tab I opened the link http://www.stackoverflow.com. The screenshot below shows the result.
I had already logged into Google, but it is showing me that Tassadaque is logged in. Let me mention once again that we are sharing same public IP address on the LAN.