thanks for the responses guys! although i'm not sure where this leaves me...i think the metal trash can is not a bad idea, but i also want to be safe...
okay, i got some ideas.
get a green screen (easy way to make a super cheap one is to go to walmart and pick up a bunch of 49 cent lime green posters, and tape them together on the back end)
now, get the paper i spoke off above, and tape it around the trash can.
go outside and film the trashcan at the angle you plan to shoot in the room indoors with the fire going.
now once you remove all the green you should have the smoke and fire ALL BY ITSELF. you can move it around to fit perfectly in the trashcan in your housewith some video editing.
not good enough, you need to be able to kick it around a lil?
(now even though kicking around a trashcan that is on fire in you house is RETARDED, there are only longggg detailed ways to imitate it(without making it look fake). my advice, axe out the scene if it requires it.)
another thing you could do, make it a TINY fire, mostly fast burning brush, and mix in a LOT of dirt. this will cause a HUGE amount of smoke, and you CAN NOT breath it in for long. so keep your windows open. test to see how much dirt you will need to keep the fire at a safe level and smokey enough for people to know that there is a fire in the film.
cons of this.
your camera needs a clear shot if you want it too look right, that's why most high scale movies, record smoke effects in front of a green screen and plug them in using video editing along with some CGI.
the only other thing i could suggest is...... throw a lil bit of burnable material that can easily be put out at the very bottom of the trashcan and hope for dear life nothing goes wrong....
that and don't even use the scene.
WHAT I WOULD DO.
go outside and film it in front of a green screen. along with all the cast and crew, make it easier by only doing upper torso, if just doing the trashcan alone is not a option.
when filming, you have to be very aware on how you plan to achieve your effects.on major films, the effects team and the lighting team and the cameramen work EXTREMELY close together.
hope this helped some how.
and remember, nothing beats the real thing. but, the real thing has the possibility of costing you a lot of money.....