Girl wants a job, Jacob interrupts her

Just found this vid - not sure if you can see it since i dont have an youtube link (may be old..)
http://www.facebook.com/photo.php?v=3645285510402&set=vb.352840478078551&type=2&theater

I actually lol'd hard at him, but i want to know, if someone knows what is the song (or i guess melody from a song) that he starts singing at 1:38


Non flame feedback appreciated :D

edit: its http://www.youtube.com/watch?v=LDtYkOrV4-E

But still funny vid :D