Novelist Zadie Smith’s younger brother Ben has a rap-comic alter ego, Doc Brown, who cannot abide a subpar cuppa. In fact, it’s the one topic that gets him properly fired up to rap, as you can see by the lyrics: "What I see made my heart burst / you went and put the fucking milk in first. … You picked the wrong brother’s cup to mess with / Now go get me a motherfucking digestive." Guess we all have our hot buttons. See the rest of his raging in the video below.