What?
Really not work related but if you know your sharepoint site:

Custom Error
http://<My_SharePoint_Site>/_layouts/MySite.aspx?Error=You%20are%20a%20jerk%20and%20SharePoint%20does%20not%20share%20with%20jerks.


Installer?
http://<My_SharePoint_Site>/userdisp.aspx=ID=1
Paying attention to the URL this will show you the domain and username of this accountname in Active Directory.

I know the AD domain and username, show me the person!
http://<My_SharePoint_Site>/Person.aspx?accountname=MYDOMAIN\myusername (where "<username>" can be domain\username or just username.


Master of the Universe!
http://<My_SharePoint_Site>/Person.aspx?accountname=MYDOMAIN\myusername&Source=http%3A%2F%2FMY_SHAREPOINT_SITE%2F_layouts%2Fuserdisp.aspx%3FForce%3Dtrue%26accountname%3DMYDOMAIN%5Cmyusername%26Title%3DMaster%20of%20the%20Universe (change all instances of MYDOMAIN, myusername and MY_SHAREPOINT_SITE accordingly).


The moon to play with

• /_layouts/people.aspx?MembershipGroupId=# where # is the ID number of the group (will error on invalid IDs).