Just play this and you'll find out ;)
Em D G C
All I thought was a dream (make a wish)
Em D G C
Was as real as it seemed (happy birthday)
Em D G C
All I thought was a dream (make a wish)
Em D G
Was as real as it seemed
C
I made a mistake!
Source: https://tabs.ultimate-guitar.com/tab/flipsyde/happy_birthday_chords_375452