Hahaha, yes, I know those days.
The other month I was asked by an instructor to give a brief (impromptu) introduction to the library to his students.
Me: Welcome to the library, blah blah, we have computers available here that allow you to search for blah blah and for blah. We have current periodicals to our right here that can be checked out for 1 week and you can also request items to be sent from our other campus. Blah blah blah.
Teacher, who has been flipping through a magazine: Great! Can you tell us about the computers you have in the library?
Me: Uh... yeah, ... we have computers available here that allow you to search for blah blah and for blah.
Teacher, still going through the magazine: Thanks! What about these magazines and periodicals over here to the right?
Me: *sigh* ....