Which good deed makes you feel smug for the rest of the day?

You flash your lights, they raise a grateful hand, and suddenly the M25 feels almost civilised. A small mercy that costs you three seconds.

Standing all the way to Morden isn't fun, but the appreciative nod from a weary commuter is oddly nourishing. Bonus points if you pretended you were getting off anyway.

You could've kept the cash and no one would've known, but you didn't. Congratulations, you're a better person than most Netflix documentaries suggest.

A quick natter about the weather might be the only conversation they have all day. Suddenly your afternoon has meaning and you know all about their hip operation.

The full English was £8.50 and you left a tenner. The waitress smiles, you feel like a Rockefeller, everyone wins.