Wonders of KFC customers AGAIN!!

Out of the customers i've served so far in my job at KFC. This one customer got me so annoyed.
Customer 1: Could i order a family feast?
Me: Okay. Do you want it original or hot and spicy?
Customer 1: Original and also i don't want any thighs, i'm okay with just one.
Me: Thats $XXX.
I go off to get his order. And i give it out to him as he said. No thighs but one.
*Few Minutes past*
Customer 1 comes back.
Customer 1: I thought i said i didn't want any thigh but just one?
Me: Sorry! I'll get some other parts.
Checking the chicken again.
Me (thinking): There is only one. Maybe he got confused with the breast and ribs.
So I just took the breast and thigh out and but some drumsticks and gave it to the customers.
*Few minutes past*
Customer 1 comes back again.
Customer 1 (Angry): I THOUGHT I SAID I DIDN'T WANT ANY THIGHS.
Me (thinking): I'm pretty sure there isn't any left.
I checked again and there wasn't any. So i go tell him that there isn't any.
Customer 1 pointing at the drumsticks.
Customer 1: SEE THERE ARE THIGHS!!!! (Pointing at the drumsticks.)
Me: =.="
Me (thinking): WTF!!! THATS A FREAKING DRUMSTICK NOT A THIGH.
So i tried to explain that it's a drumstick not a thigh. And customer 1 got so much more annoyed. Since i tried to prove him wrong. And in the end he just said i was wrong and just walked off.
Me (angry): HOW STUPID IS HE!! CAN'T EVEN TELL THE DIFFERENCE BETWEEN A THIGH AND LEG. DUMB***!!!

On a note i also hate those customers who make up their own menu and try to argue with me that the menu does exist. Oh and don't get me starting on seniors. They are so annoying. Nadia had this one customer right since he was a senior we gave him 10% off since we give senior discounts. He ordered a some chicken but it doesn't come with coffee. So Nadia charged him for the coffee. He then started to argue saying he shouldn't pay for the coffee. So in the end nadia didn't charge him for coffee. Once she gave the coffee out he started to ask for orange juice. And it goes again, in the end we gave the juice for free to him. I MEAN COME ON, SERIOUSLY. YOU GET FREAKING 10% DISCOUNT AND A FREE COFFEE!!! NOW YOU WANT FREE JUICE!!! WTF!!!