Both Magnus Lift (which is where backspin or topspin causes deflection of a tennis ball) and the Coanda Effect (where a stream of water is deflected by the back side of a spoon) are the result of boundary layer deflection by interaction with a boundary. By conservation of momentum, if a jet or wake is deflected in one direction, then there is a lateral force on the object producing the deflection in the other. Here we demonstrate both effects using the jet provided by a vacuum cleaner and a large styrofoam ball. While you are probably most familiar with these effects in sports, they play an important role in aerodynamics. A really weird example is the use of Magnus lift to provide propulsion for freighters. These "rotor ships" are described here. Basically, a giant rotor (called a Flettner rotor) can turn a cross wind into forward thrust, improving fuel efficiency.