Changing light bulb + it's stuck + will it cause fire? HELP.?

No, it probably won't cause a fire, but you should get the bulb out, anyway. I assume that the switch was in the on position when you started and that's why the circuit breaker tripped, so first thing, make sure it's off. If the glass is still intact, wear leather gloves and try to work it loose, so if it breaks it won't cut your hands. It should come out with a little gentle rocking back and forth, but if it breaks, it might be easier to remove. Some people recommend using a potato jammed onto the socket to twist it out, but I've never had much luck with that and I'm of Irish descent, so hate to waste a potato and prefer to use pliers to either twist the socket out or remove it piece by piece.

Again, make sure the switch is off, no matter what you do.

Also, you should never use water on an electrical or fuel fire because it can cause a fatal shock or spread the flames. Water should only be used on a class "A" fire, which is anything that leaves ashes, like wood, clothing, paper, etc. A much safer precaution for an electrical fire is an extinguisher that is rated "C" because it won't cause shocks, though the first thing you should do is turn off the power. For a fuel fire, such as one in a pan of cooking grease, smother the flames with a towel or use an extinguisher rated "B". A decent home fire extinguisher, available at any hardware store, home center, or discount retailer will be rated "ABC" and be safe to use on all three and it's recommended to have one on each floor of your home and one in the garage. Sorry, you didn't ask about fire safety, but it's important and you mentioned water in your question, which caused me some concern.

Get the thing out and replace it. It may have some corrosion because it's in a damp environment and be difficult to remove. It will come out with a little care and dedication to the task, but it probably won't cause a fire. Sometimes the simple tasks that become larger than they should can be very frustrating, but at least it isn't something really disturbing and potentially expensive, like a plumbing problem.

If circuit breaker has tripped there is not danger of fire. If the circuit is live there is the potential danger of electrocution as the filaments of the light bulb are part of a live circuit and can cause electrical shock. To remove a broken light bulb from a socket try using a potato. This should be done only when power has been removed from the circuit at the circuit breaker. Never try to remove a bulb this way with the power on. Slice potato in half and press against broken light bulb. After pressing potato against bulb just screw it out.

Spray with 4d-40. Try again in the morning. If that don't work. With power of. Break the bulb. Remove with needle nose pliers. The problem is any time you pass a electrical current threw 2 different metals and moisture. You have corrosion between them. Put new bulb in not to tight. Turn on power.

It will cause a fire if left unattended. The wire in the bulb will burn since it's not getting a steady current exploding the bulb glass and successfully creating a flammable gas which burst into flames causeing anything nearby to erupt in flame. Break the bulb remove with pliers.

No. There is a safe plastic non conductive $4.00 broken light bulb extractor sold in hardware stores.

It won't cause a fire.

no it won't. if you think that is bad you should see how my grandpa wired my house lol