"Apple Pepsi" is freakin' delicious.
It's 3/4 Pepsi, 1/4 apple juice.
Alternately, apple WITH pepsi, is 3/4 apple juice, 1/4 pepsi. Also delicious.
The same applies to orange juice. Someone argued that you are only supposed to combine pepsi with vodka, likewise you are only supposed to combine orange juice with vodka.
I therefore argue that pepsi and orange juice are the same thing, and thus there is no harm in combining them.