Rear light flickering

I was told last night (By a cop) that my rear brake light was flickering on a off rapidly when i was driving.
Is this just a sign that the light needs a replacement?
Is there some sort of short?
im gonna go to Crappy tire to get a new bulb but i have never really seen something like that b4
if this has happened to you, pls get back to me
thanx

Bulbs are cheap, might as well buy one and try it, and keep it as a spare if anything.

If this does not fix your problem, could be water/corrosion in the socket or grounding or a bunch of other things.

Let us know if the bulb fixes it.

Good luck.

Yah, either the front or rear turn signal is probably out…
Im pretty sure the rear bulb is a 3157 at candian tire, if not its a 3057