Dan, are you crazy ???!!! Don't you realize you are starting a chain of serious consequences when you do this ? They are, but not limited to :
1.Premature wearing on all of the shocks, as fluid is broken down by being forced through small holes, and coils are being senselessly compressed, causing irreversible metal fatigue.
2.Destruction of tire integrity, as your body weight is being forced downward by gravity. This creates un unequal distribution of force, causing flatness on the bottom of the tires, while the rest of the tire remains round.
3.Crushing of the seat. Your seat contains foam which has millions of small air pockets. These pockets are destroyed each time weight is applied, and bounce back when weight is removed. However, at a cellular level, these pockets are incapable of returning to 100 % of their original shape each and every time.
I hope you feel good about yourself. Why don't you just give your spyder to a proper home rather than ruining it with your childish antics.