Change Your Mind, eh?

Waiter : So, what do you want to order for drink?
Friend#1 : Ice tea
Friend#2 : Ice tea
Friend#3 : Ice tea
Me : Today's my birthday, so I want to have mango juice
Friend#4 : So, you are treating us?
Me : Yes

Friend#1 : Eh, I change the ice tea to Orange juice

Friend#2 : Guava juice

Friend#3 : Strawberry juice

Friend#4 : Melon juice

Me: Errr...