When I was around 20 years old, I was working the Sports Department at Myer Southland. I wasn't known for my patience with difficult customers at that time. One day, a guy comes up to me, with a shoe off our shoe wall, and says:
"Can I try these on in a size 11 and a size 7?"
Me being the typical impatient person I was, grabbed the shoe off him, rolled my eyes, and started to say
"Mate, you are not going to be a 7 or an 11, you ......."
It was at that eye rolling moment, that as my head went down, I noticed. Indeed this guy had one foot extremely bigger than the other! Also, his "big foot" leg was much bigger, and more developed than his "little foot" leg, especially the calves.
I stopped, paused just long enough to signal to him, that yes, I had indeed made a prize ass of myself, and said:
"No worries mate, just take a seat over there, and i'll be back in a sec".
When I got back with the shoes he was gone.
I must admit, it did give me pause, and made me think, that the next time someone asks me something seemingly ridiculous, I had better try and get more info, before jumping to conclusions.
That didn't stop me making similar mistakes in the next few years though. Learning things like that is a slow process for some of us!