My brake Lights are stuck on
 

I have a 2002 Chevy 2500 HD. V8 8.1L Crew Cab(Dont know if this will help)

The Brake Lights are stuck on and I have a trailer Chevy Emblem that also is lit up when plugged in. This includes when it is off and on. At least in park and reverse.

What are the most common issues involved?

I have disconnected the battery at this point and am stuck at work right this instance...so...some help would be nice.

After i plugged it back in...it hasnt happened again...