Just thought of another one ....

I arrived in Calais, France on the ferry and started cycling around the city looking for the train station. I had instructions but somehow I got completely turned around and could not find it. Finally I stopped at a gas station to ask the cashier where the train station was.

The French word for station is gare.

The French word for war is guerre.

To my ear, they sound exactly the same. The poor cashier was so confused until I finally raised my hand as though I was pulling a bell cord and asked for the "Choo-choo".