How does this happen?

[Chargen69]

Just wondering if there is a mystical reason or just a complete idiot worked on my car.  Short story is, car has been apart a long time now, all the paint is done and the motor, trans and K-frame were put back in yesterday.  Later on in the day this friend of mine who is building the car calls me and tells me that the car has two right side upper control arms on it.  GREAT! We didnt look at any of this stuff real hard when we pulled it apart, but they saw it before they put it back on.  So, was there some application back in the day for needing the car to pull hard to one side?  It was a low mile car with no crazy mods, so it wasnt raced or anything like that.  or do you think somebody was drunk when they worked on it?

[Ghoste]

My guess is just that at some point someone needed to change a control arm and they were unaware there was a left and right.  Or they didn't care.