The spider won't bother you, because it's probably hiding right now just trying to find a way out. There are no bugs in your room for it to catch and kill so it'll probably die soon from lack of food. Don't panic!
Don't panic and follow the instruction:
1. Grab a gasoline container and pour it all over your room.
2. Find a match or a Zippo lighter and light up the room.
3. Run.
Ps. You may die in the middle of step 2.
I wouldn't worry about the spider, it isn't going to bother you.
I had a few spiders in my room that lived most of the season. If it can find insects to eat, it may stay around, or it will leave on its own.
One of my pet house spiders lived behind my water cooler nearly 5 years.
How about spraying the whole room with bug spray? Eventually it may come out to find an escape. I did the same for flies a while back from leaving the door open.
SO I WAS JUST CHILLING AND SAW A BLACK SPIDER (PENNY SIZED MAYBE??) AND THEN MY MOM OPENED MY DOOR AND IT FELL AND I LOST IT. SO WHAT DO I DO LIKE DO I WAIT FOR IT TO DIE??? HOW LONG DO THEY LIVE IN A BEDROOM??? CAN I DO SOMETHING TO LURE IT OUT?????? HELP ME