I landed in Munich, jumped in the first cab I saw and I started to talk with the friendly Turkish taxi driver that had a rusty English. After some laughs I told him that was my first time in Munich, and he replied:
"You good man, so I tell you: Never say to taxi driver is your first time in city. He make circles and bamm.. 150 euros. No no no". And with this lesson started my DrupalCon Munich experience.