Thou shalt not judge.
It was honestly one of the most interesting series of talks I've listened to.
Let's start from the beginning. My journey: I got the tube with my brother (it so happened that his University is actually, literally around the corner from the Institute of Education, where I was heading). And you know what I realised? It is incredibly difficult not to eavesdrop on people's conversations in the tube. I mean, think about it - you're sitting there, sufficiently bored to nod off, with your brother next to you reading Musharraf's biography. Your mind can't help but wander to the next person's (relatively loud) conversation with their friend. After all, it needs some activity to remind itself that it's alive. Thankfully, the substance of the dialogue escapes me, so I won't be leaking any intercepted intelligence today.
I have saved the best for last... but for it to make sense I suggest you watch them all, in order. They're not that long.
(Watch out for the warning given to Ollie concerning exploding dustbins.)
(Oh and the brown things that the man and Ollie place on the floor in one video are violins. Yes. They played violins, and timed their music exactly with one of the experiments they had set up on the table - the colour change in the beakers would suddenly cloud up as they started the next part. HOW COOL ARE THEY?)