Just came back to this thread, and saw there was much action here for the past 4 months, all of which I missed, somehow.
As far as the problem with overloading a fixture (100 watt bulb for 60 watt fixture) ICOT is 100% correct. More current will flow than the system is rated for, generating more heat than the fixture is rated for, which is a fire hazard, as ICOT says.
Mod-80, that business of pulling electrons from the air is a very creative and radical theory, but I don’t think it is accurate at all. Voltage is what pulls electrons. How many get pulled as a result is the current that flows. It is true that a very high voltage can cause arcing which looks like lightning, but that cannot happen here. 120 volts or even 240 is not enough to cause arcing. If it were enough, then every time you turned a switch off, it would be a hazard, because the electrons would try to jump across the switch contacts. Every electric socket in your home, even if not used, would be a hazard, because electrons would try to jump from one conductor to the other. But even 240 volts is safe for arcing, so we don’t have to worry.
Whether you use a 60 or 100 watt bulb, the voltage is the same. a 100 watt bulb has less resistance in the filament, which allows more current to flow, and more heat and light to be generated.
Note that arcing is caused by a very high voltage which does rip electrons from the protons and neutrons of the atom. While air is a very good insulator until a point, it will break down in a high enough voltage. In your car, there are spark plugs for each cylinder. There is a transformer which converts a lower voltage to a very high voltage (I think in the tens of thousands). This causes elctrons to jump between the terminals. The resulting spark ignites the gas vapor and explodes in the cylinder, pushing the piston down with great force which turns your wheels via connecting shafts. Lightning is a form of arcing caused by high voltages in the clouds which develop possibly due to friction, like when you rub against wool and touch a doorknob.