We have signs by our order takers saying that we are only accepting cash in drive-thru and credit and debit to come inside (due to erm technical difficulties).
Well this woman pulled up and proceeded to argue with me.
Me (seeing a credit/debit/whatever card): Sorry Ma'am we're not taking cards.
Her: What do you mean?
Me: We're not taking cards Ma'am, we put up two signs to let everyone know.
Her: There aren't any signs out there!!!
-Pause-
Me: Ma'am, there are two signs out there. I know because I put them out there yesterday and as I drove into work today I saw them.
after that i had some people proceed to argue with met hat the signs needed to be moved somewhere sooner than the speakers. The only place we could would be along the windows leading to drive thru. and NO ONE looks at the windows.

The second fun lady had to deal with ice cream cones. went something like this:
Her: I want an ice cream cone and a coke.
Me: Sorry Ma'am. we can do a plain sundae, ice cream in a cup but we can't do an ice cream cone.
Her: Why? is the machine broken?
Me (blink): No ma'am. We don't have any cie cream cones for the ice cream cones but we CAN do a plain sundae for you.
Her: So can you put in a cup?
Me (sigh): Ma'am that's what I just said we could do (twice). We can do a plain sundae, ICE CREAM IN A CUP.
Her: Oh!! Ok, I'll take one of those.
Me: -head bangs against the wall-