Its the piano part at the beginning of the song.
[ Tab from: http://www.guitaretab.com/e/eiffel-65/202862.html ]
e--------------------------------------------------|
B--------------13-------------------15-16----15-13-|
G--15----12-15-------14-15----13-15-------14-------| (x3)
D-----12----------15-------------------------------|
A--------------------------------------------------|
E--------------------------------------------------|
e--------------------------|
B--------------13----------|
G--15----12-15-------14-13-|
D-----12----------15-------|
A--------------------------|
E--------------------------|
