Wanting help in writing the query in sql server 2008 on displaying the result set side by side

Question

I have the Customers table as follows:

Firstname Lastname DateofBirth dev ger 12-5-1977 sjr ind 12-5-1977 man lak 14-9-1981

I want the query based on the above table to return the customers having the same date of birth.But it should be displayed as follows:

Firstname Lastname DateofBirth Firstname Lastname DateofBirth dev ger 12-5-1977 sjr ind 12-5-1977

Please reply asap.

Thanks