Customers Confounded Counting

I had a great day at work for the most part. My manager Fred was working, along with another supervisor Frank. Fred and Frank are awesome.. Together they might be the coolest thing sense sliced bread. The "for the most part." is because I was literally flabbergasted by a customer. He ordered a quad grande white mocha and a chocolate chip cookie. Total: $6.45. He puts a dime and two nickes on the counter and pulls out 6 crisp new one dollar bills. Awesome... except thats only $6.20, so I look at him. Six dollars in my hand and the change on the counter, and I repeat the total. "thats $6.45 sir." ::smile::. he looks at me like I'm an idiot and points to the change on the counter. and I said, "you gave me $6.20 sir" ::smiles:: he looks blankly at me... looks at the change and says "no. I gave you $6.45... you forgot the change on the counter" suggesting that I either dont know the international sign for "look" when he pointed to the change the first time, or that I'm stupid and cant count. so I tell him. "thats a dime and two nickles" (what else was I supposed to do? I mean keep in mind this has already been a 4 minute transaction) He gets his face about 6 inches from the change and says "O. I thought one of those nickles was a quarter." PICKS UP THE NICKLE and puts down a quarter. I look at him... speechless. I now have $6.40. $.05 short of what I needed. ::sigh:: "Sir this is $6.40." (a line has now formed behind him.) I grabbed a nickle from the tip jar and told him to have a nice day. he gets upset and says "I can pay for my own drink." puts a nickle in the tip jar and judging by his 'dissatisfaction' from my service throws all the change in his pocket into the tip jar.
i swear you cant make this stuff up.