Methyl Blue in a drink will do that to their pee...
Will it make them stand on the toilet seat as well, staining it green?
@WonderWartHog99 Depends on how freaked out they get....When I was in high school several ounces of it suddenly evaporated from the lab... People also by some strange coincidence starting pissing blue and green from time to time.... While I can't say the events were related I found it very amusing...
@Lizard_of_Ahaz Had barefoot midgets in your lab for those tiny foot prints?
@WonderWartHog99 Once somebody left their cage door open and the kinky little fuckers were running all over the place...