The force of gravity increases with distance above the ground or floor. The process is analogous to steady-state theories of the universe which postulated that the tensions involved in maintaining a space would cause the creation of hydrogen from nothing. One may imagine C-spaces where all matter and energy result from primal masses of dynamite exploding. A big bang indeed. Any bag, sack, purse, etc.
Characters can spin around and change into any set of clothes appropriate to the situation.
Movements are accompanied by funny sound effects. Especially eye blinks, which usually are accompanied by xylophone or or other percussive noise type tinkles with each blink. This causes the vehicle to coalesce into an observable form at that location, maintaining high velocity. Classical cartoon physics take over at this point. The character's feet move at incredible rates, often blurring into an indistinguishable circular haze.