Consider this... humour is a wonderful networking and mentoring tool. It breaks the ice, relaxes folks and offers a small bridge towards the grey zone (see Oct posting: Grey Zones).
I'm not talking about stand up comedy or poorly conceived jokes. Just the little quips, observations and silly asides that can liven up a conversation.
It's using your 'inside voice' judiciously. It often has a grain of truth to it. And it creates a point of connection between you and the person who also found that something humourous.
Networking events and one on one coaching sessions can be so deadly dull! Folks can come away feeling disconnected, bored and/or overwhelmed. Laugh a little together.