There I was, me teaching a class about the Internet and what it can do. I was being observed by an external moderator thingy and so I was under a bit of pressure. Everything was fine though...
...until my mind went blank.
I was giving examples of websites and what their urls are made up of (www, domain name etc.). I wrote down ebay and amazon and google, the popular choices. Then a colleague interrupted the lesson - to get her back I asked for an example of a website address - she said dogpoo.com!
Luckily I managed to bring the lesson back to speed and wrote up www.bbc.co.uk (I think), but I'm sure the observer heard her and I'm certain all the learners did too.
Moral of the story? Don't ask colleagues for suggestions.