How to be Insulting in the Street: Approach a complete stranger as if you are about to welcome them warmly, but instead walk straight past and disappear into a shop.
How to be Insulting in the Street: Find a bus stop with a waste bin attached to it. Hide a small bottle of champagne and a leg of chicken in the bottom. Wait for a queue to form at the bus stop, then go and rummage in the gutter, and finally look in the bin. Find the things you've hidden, and devour them in front of the people waiting for the bus.
How to be Insulting in the Street: Wave frantically across the street to people who are trying to ignore you and try to attract as much attention to them as you can.
How to be Insulting on the Beach: Sit by the water with a fishing rod, and throw revolting lumps of old bread into the water where the children are enjoying themselves.
How to be Insulting in Banks: Take a tape recorder with you to the meeting with the manager. Say nothing the entire time, but simply record all he says to you. Then when he's finished play it back to him at twice the speed and leave.