The possibilities for using a bicycle are seemingly endless. Take this creative use, for example. In Lisbon, Portugal, knife sharpeners walk or ride the streets on their bicycles and signal their presence to residents and people in the area with a pan flute. When their services are needed, they stop and set up shop on the bike. In the video below, you can see how the knife sharpener’s bike is easily transformed into a pedal-powered sharpening stand. Very cool! Via Bike Hacks.