Assassin's Creed: Brotherhood

You won't be able to do this until sequence 3. At the start of that sequence there is a memory in the southwest for La Volpe. During this memory you'll now have noteriety for the 1st time after you lead a guy to safety. There is an orator nearby. Approach him and press triagle to bribe then bump into him and press "X" to still the money back. Can be done with any orator in the game from this point on but this is the 1st chance to get it.