third brake light not working

I failed an inspection last year for my brake light not working. When I went to take interior light out to take a look at the wiring the light decided to start working. Recently I noticed the light stopped working and Im almost due for another inspection. Does anybody have any ideas on what it could be? I have tried moving the wires around to see if I can make them come on but it doesn't seem to be a connection problem.

Is it the bulb?I know it's a dumb question but a broken filament can jump around and touch every once in awhile.

yeah i felt dumb when mine did this and i posted, i got to looking at it, and all it was is the metal was secure in one side, and on the other it was touching all glass, no metal at all, go a head and give that a once over

the miltifunction(turn signal) switch is bad. turn on the hazzard lights and bang on the top of the steering column a few times. now the brake light might work intermitently. the switch is kind of expensive and a real pain to replace if you havn't done one before.