Sometimes, words just don't translate from person to person, despite speaking the same language.
Patron: I need books about bowling for class.
Me: Books on bowling?
Patron: Yeah, it's the only thing I could think of that other's weren't doing.
Me: *searches* Okay, they're over here.
Patron: *scratches head* Bowling. With a 'u'.
Me: *bowling with a 'u'? Bulling?* *lightbulb* Bullying!
Patron: Yeah, exactly!
Me: *laughing to myself over my error* In that case, they're over here.
Patron: *laughing with me*