How to be Insulting in Church: If you just want to look inside the church, go in when you see the sign 'Service in Progress'. Take photographs with a bright flash-gun.
If you ever fart in public, just yell, "Turbo power!" and walk faster.
How to be Insulting in Banks: Try to use one of the automatic cash dispensers, but use it incorrectly. If it's inside the bank, do this until someone is sent to help you out, or until you're asked to leave. If it's outside the bank, kick the machine and try to open it with your car keys, a penknife or your umbrella.
How to be Insulting in Banks: When ordering travelers checks, try to get the smallest denomination available, and then take ages signing each check in front of the cashier.
How to be Insulting on the Beach: If there's enough sand, dig huge walls around your site and try to put your neighbors in the shade.