Really good, really easy song. 
Here are the correct chords that the band actually plays 
in the song, seriously, just play with.

Verse: G - Em 3 times and then C

Chorus: G - Bm - Em - C

Bar chords sound a lot better with the song, especially because
the Em is the high Em (A string 7th fret), have 
fun singing to this fantastical tune now!