Thieves and pickpockets can blight your trip. Never leave valuables unattended, and never carry valuables in any pockets. Use a neck pouch under your shirt or a money belt inside your slacks. Gypsies are especially skillful and active in Rome on public transport and in popular tourist spots. They are often young girls with babies and children aged 10 to 14. But thieves can also look like nuns or priests or business men. The Italian people will often give tourists a signal to watch out for known thieves when they see them. Be especially on guard in crowds. Interactions with aggressive vendors on the street can be costly. Rose sellers and costumed gladiators expect fees.