Physiotalk help needed - 12 hours to help me choose a topic

It's probably as a result of the growth of the Critical Physiotherapy Network, but I've been asked to run one of the Physiotalk Tweet sessions next Monday evening (GMT), and I get to nominate what the topic is in advance. These are one hour-long Twitter based chats around a particular theme to do with physio.  You can find some of the recent ones here.

It could be a great opportunity to talk about critical physiotherapy, the Network, philosophy and physiotherapy, etc., but I'm not sure what topic would work best, and so I need your help.

I've got 12 hours to decide what to do.

Can you send me your votes on this poll to give me an idea what would appeal to you, if you were going to take part. [Post update: the poll is now closed (suggestions submitted are presented below), but you can read a copy of the transcript & Dave's reflection on hosting the Tweetchat here]