Golden State Warriors -- Street Fights and Death Defying Jumps ... In Victory Celebration

The Oakland PD tells TMZ Sports there were two arrests and eight citations, for various violations. There were no reported incidents of vandalism to businesses.

It was CHAOS in Oakland Tuesday night ... with Golden State Warriors fans brawling in the streets -- and one fan INSANELY jumping off a street sign ... and it was all caught on video.

No word why the crowd started fighting ... or if anyone was arrested ... but it was pretty violent, as you can see in footage captured by Todd Johnson of the SFBusinessTimes.

Todd also rolled as some CRAZY fan scaled a street sign ... and then LEAPED OFF ... into the arms of waiting Warriors fans who, thankfully, caught him.

The man appeared to be okay and continued to rage in the streets.