It seems that the Stack Overflow Careers account signup requires you to pass a small test of inference before it deems you worthy.
On the permissions dialog, I see two hollow orange lozenges below the declaration:
When I hover the cursor over the left lozenge, it fills itself in with 'Approve':
When I hover the cursor over the right lozenge, it fills itself in with 'Reject':
Is this a real test, or just a mystery-meat-navigation bug?
My browser is Opera 12.02.
Spoiler Alert: It was a challenge, but I worked out that if I click inside the left lozenge, my reward is an account.