Your urine COULD be brown because of that antimalarial drug, chloroquine, you took before you headed down to the Amazon on that trip earlier this year to recover the lost scepter of the dead amazon tribe. Slashing through the jungle in waist deep vines you find the golden palace but it is guarded by legions of semi-philanthropic but strictly anti-human anthropomorphic panthers with telepathy. Somewhere deep in the jungle far off in the distance a bird calls and you wonder if this drug will keep you safe from the teeming legions of mosquitoes.
But it is way more likely that your urine is brown because you decided to put a metric crap-load of fava beans in your four alarm chili during your weekend at Lake Ontario. SPRING BREAK 2015! Or.... you exercised too much recently. Likely the fava beans.