Hacked Bike Pump Can Siphon Air From Automobiles
A DIY emergency bicycle pump using only a hose pipe and a few chucks.
This automatic bicycle pump is the work of an Instructables member and can be used to inflate a flat by connecting it to a car’s tire and sucking air out of it. The pump is nothing but a long air hose and two chucks; fold the hose in your hand and attach one end to the car tire and the other to your bike. When unfolded, the air flows from the automobile to your bike’s wheel.
While its a good hack and could come handy in emergencies, its highly recommended to first take permission from the car owner