"Dunnadunnalunnalunna batman!!!" joke

Ok. This kid has to learn the first two letters of th alphabet so goes to his little brother who was watching batman so the kid asks "
little bro what's the first letter of the alphabet?"
and his brother sings "
dunnadunnalunnalunna BATMAN!!!"
and then the kid goes to his other friend and says "
what's the second letter of the alphabet?"
and his friend says "
dunnadunnalunnalunna FATMAN!!!"
so the next day the kid goes to school and says "
the first letter of the alphabet is dunnadunnalunnalunna BATMAN!!!"
and his teacher tells him to go to the princeable. and at the princeable's office the princeable asks "
who do you think I AM???!!!"
and the kid sings out "
DUNNADUNNALUNNALUNNA FATMAN!!!"