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[starlagurl]

http://www.dutchamsterdam.nl/33-things-to-avoid-in-amsterdam

Some of these, I've totally done before including:

…ride the trams without a ticket
A new electronic ticketing system is in the works, but for the time being you can still board many trams without having or self-stamping a ticket. If you get caught you’ll have to pay a hefty fine on the spot. Buy tickets in advance at a train station, tobacconist, newsstand, post office or the Albert Heijn supermarket. Tickets bought in the tram (or bus) are more expensive. Get them from either the driver or the conductor. Not all trams have a conductor.

I never got fined, but I had a stern talking to in broken English.