why are you me

When someone does something that you do the same

*Someone eats a whole Easter egg when the serving size is 1/5th of the egg*
If you would do the same you would say
"Why are you me"

Why is ____ ____
When 2 people behave the same
*Rob always says yo yo yo fella when he greets you. You meet a man named Charles and he greets you with the same thing*
"Why is Rob Charles"