This sounds like an enquiry from someone sat in the QHI groundschool, with a 50 minute lesson coming up.
Firstly, boring as it is, try to stick to the pish they've taught you. They do not like you going off piste.
I once did a lesson on the effects of icing. I googled icing and came up with a long lists of horrendous crashes - all due to icing which was a good introduction as it grabbed the attention. As well as that, if your looking to eat time up at the end, you can refer back to it at the end and discuss how what they have learnt played a part.
Or you could go down the RAF Regt route of picking someone with a vacant look, pose a ridiculously vague question, pounce, and then spend 20 mins taking the urine for getting it wrong.
Good luck anyway