R2-D2 speaking English
As we all know by now, C-3PO is the robot that talks, and R2-D2 is the one that makes those adorable beeping noises. But things were not always set up to be like that, in fact, there was an idea to have R2-D2 speak in normal sentences using the English language.
Just imagine how weird that would have been now, after knowing and loving the character just the way he is. Not only would he have spoken in sentences, but it would have changed his personality as well, no longer would he be lovable and funny, but a bully that threw around insults.