What do you do when you are not invited to a party that some of your friends were going to?

Iwouldn't do anything but I'd be a little mad cause they didn't invite me.I would invite them to my party, and it would be at Pizza Putt.Theirs would be at Pizza Hut.One day I was going to Pizza Putt and someone's birthday party was their so I asked my dad if I could join them too.... he said yes you can if it is alright with them so I asked them and they said "yes" so we got to go to their birthday party they had, cupcakes,cake,cookies,and apple juice,an milk.I would have all that and more at my birthday party.At my party it wold be super fun there would be an laser tag room.So I wold sit in my rom cause im really bored cause they didnt invite me.
p.s. I shoved a choclate pie in the clowns face.
Jonny