My wife and I called the first gen RAV4, especially the two door, a 'baby boot', so I can see where the shoe comment comes from. I had an idea for a photo that would have someone standing on top of two smarts parked very close together and shot from down low in front so it would look like to large shoes.
smartness? As others have said: the level of safety and features available in a very small package; good gas mileage and low maintenance costs (10K oil changes); ease of parking and creative parking possibilities; 'greenness' when you consider not only efficiency, but production and end-of-life environmental factors (where will all those hybrid batteries go and how good are they for the environment?); don't forget the replaceable, recyclable plastic body panels (no door dings, and if damaged, just replace the panel without body work, etc.).