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Nothing happens. I have amber and wear it with wool and other clothing. At the very most there is friction.
When you rub amber against cotton, the friction between the materials causes a transfer of electrons, leading to a build-up of static electricity. This results in the amber and cotton becoming electrically charged, with the amber typically gaining a negative charge and the cotton gaining a positive charge.
If you rub pyrite against steel sparks would fly.
Wear
The Greeks discovered (2000 years ago) that you could rub certain materials against amber and the amber would hold a charge. Their word for amber was elektron.
The ebonite rod will gather a static electric charge, as electrons are transferred.
It will shock your hair
You build a charge when rubbing vinyl with a wool cloth. The wool cloth is very weak in holding electrons so when you rub it with the ebonite rod the electrons transfer onto the rod. The rod is negatively charged (assuming that the rod was neutrally charged). The wool becomes positively charged (assuming that the wool was neutrally charged)
When a cotton shirt and wool sweater rub together, they create friction that can generate static electricity. This can cause the fabrics to stick together or even produce a small spark. The different properties of cotton and wool fibers rubbing together create a charge separation, which results in static electricity.
plate rub against each other to cause an earthquakes
Electrons are tranferred to the stick, causing it to take on a negative charge
The copper penny might get cleaner. If it were a rubber penny, then you would get static electricity.