On the joys of knowing everything - example 2

I have a work colleague who is particularly cynical and witty.  I was becoming concerned that he might be out-witting me.

But things re-balanced nicely yesterday.

We were having a chat about our favourite names when he suddenly volunteered that he was considering the name "Onan" for his future son. 

Which presented me with the perfect opportunity for pointing out to him the rather colourful Onan of the Bible...

I think he actually blushed.