Bring back hanging for people who don't use their indicators.
Close 2nd....make it a offence to pick up a shopping trolley outside Tesco, walk in a few inches of the shop entrance and then stop dead, blocking the way for everybody else, and stand looking around as if you have never been to a supermarket before.
Right now castrating all the winkers who run firms that make unsolicited, silent sales calls would do.
I was going to suggest "turn BT into a customer friendly organisation, dedicated to providing a top grade service" - but that's just too unlikely/impossible to even dream of.