Sometimes I could really curse my natural, idiotic honesty. Today I bought a cup of coffee in a coffee shop and handed over a £5 note in payment. However, the barrista behind the counter gave me change for a £10 note. Before I could stop myself, I’d blurted out, “But I gave you five pounds—you’ve given me change for ten.”

D’oh! Damn you, stupid Honest Brain—why can’t you just keep your do-gooding trap shut? We could have been a fiver up.