The guys at work used to give me energy drinks, strong coffee and caffeine gels in the hope of making me buzz.

I don't know if I've got a natural tolerance, or maybe because I eat a lot of dark chocolate I've built up a resistance. Caffeine doesn't do anything to me.

Also apparently it's not good to down a whole mug of coffee in one go. They used to find it funny when I did that. I don't like coffee but I'll drink it if you give it to me.