I introduce Heat Capacity by asking the following question: How come, when you get up in the middle of the night to take a pee, and walk across both tile and carpet, the tile seems much colder than the carpet even though in reality both are at the same temperature (room temperature)?
It introduces the concept of thermal conductivity, and also acts as a reminder to why we need objective measurements in science.

This video on firewalking would make a wonderful follow-up activity, and might just make some a little wary of  ‘life-coaches’.

Thermal conductivity and Low heat capacity; Firewalking explained in terms of taking a cake out of an oven.

Would work at both Junior or Senior cycle.

So how could you design an experiment to ascertain who is right?

And then while we’re here at all, let’s look at an intertaining presentation by Michael Shermer on debunking pseudoscience.

From http://www.ted.com; part one of two. The second half is also well worth seeing.