How to be insulting at the library: Find the coziest reading nook and start snoring.
How to be Insulting at Christmas: Try to find what you were given last year and give it back to the person who gave it to you.
How to be Insulting in Theaters: Noisy wrappings on sweets can be unwrapped at moments of tension when the rest of the theatre is silent.
How to be Insulting in the Street: Walk along as if you have stepped in something unpleasant, by pretending to scrape your feet along the pavement, or rubbing your soles on any available patches of grass. Then look daggers at anyone walking a dog.
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.