I don't know if the author of this video was trying to troll everybody by posting a question which the entire comments section would fail to make a decent answer to, but my nerd rage has now been invoked:
Bram's Nerd Rage: The Poisoned Drinks Problem
Bram's Nerd Rage: The Poisoned Drinks Problem
Bram's Nerd Rage: The Poisoned Drinks Problem
I don't know if the author of this video was trying to troll everybody by posting a question which the entire comments section would fail to make a decent answer to, but my nerd rage has now been invoked: