Answer:
We are two brothers on opposite sides of the road, but we never see each other. Who are we?
Most people need it, some ask for it, some give it, but almost nobody takes it. What is it?
Whipping one of these out in the wrong setting is said to be terrible luck.
What falls down but never breaks?
If you suffer from this, you might wear a wig
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.