Further communication issues...

I meandered into work on Thursday mulling over the things I needed to do - nothing very dramatic, just the usual. And I met a few colleagues in the yard on the way. After the greetings...
- Did you hear about our bookfair?
- No, is there going to be a bookfair?
- Yes
- Where?
- Here
- Great, when?
- Today
- Huh???

Well why would you tell the librarian? advance planning & looking at our cash-situation would just have made it all a bit easy, wouldnt it