This is not the full song, this is only what is played at the start of the show!
Nerf Herder
Buffy theme song
Tabbed by me

G———————————————————————————————————
D————————————————————————0—(x8)—————
A————————————————2—(x8)—————————————
E—0—(x8)——3—(x8)————————————————————
Play twice, 
then

G—————2p0————0—2—0———————0—2—0———————————
D——————————2———————————2———————2—————————
A—0———————————————————————————————2—hold——
E———————————————————0—————————————————————

then finish with
G——————————————————————————————————————————————
D————————————————————————0—(x8)——1(x8)—2—2—2———
A————————————————2—(x8)————————————————————————
E—0—(x8)——3—(x8)———————————————————————————————

with the —D——2—2—2—— at the end, you can either play the open E, or play both, or strum 
the two notes — 
A—7—— 
E—0——
,so as long as u play an E, it sounds right.