That's not really what I meant. I was trying to come up with some experiment that could be performed.
For example, I pointed out a few weeks ago that FET and RET have different answers to the cannon ball problem. A person is standing on top of a tall tower. He has a cannon leveled perfectly parallel to the ground. He fires a ball out of the cannon and drops a ball at the same time. Which ball will hit the ground first? FET will tell you that both balls will hit the ground at the same time, but RET says that the dropped ball will hit first(the fired ball will fall around the Earth a little bit before hitting it, much like a satellite). The problem is, this experiment requires a ridiculous amount of precision to do correctly.
What is some other prediction that is different in FET and RET that can be tested.