The easiest way to play the brown note is to dip your plucking finger in Root Beer with one full bar of Ex-Lax dissolved in it, and then any note you play is brown. A few have dipped their entire bass in this Root Beer concoction, but this is simply overkill and results in sticky (&or stinky) intonation issues.
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Contrary to popular belief, Jaco did NOT eat fried chicken with his fingers before performing. Like how many rumours get started, the truth was slightly exaggerated and distorted over time.
Jaco liked to eat Chicken Cordon Blue before performing, but he used a knife and fork.