Answer:
What type of dress can never be worn?
I jump when I walk and sit when I stand.
This guy crossed a road and everyone wants an explanation.
Although it sounds like I work on a transportation device I actually work in a restaurant.
First you see me in the grass dressed in yellow gay; next I am in dainty white, then I fly away. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.