Pomace spirit (or pomace brandy) is a liquor distilled from pomace that is left over from winemaking, after the grapes are pressed. It is called marc in both English and French, but "grappa" in Italian and "bagaço" in Portuguese.

Just as a good wine can uplift one's spirits, so too can these thoughtful wine quotes: "Wine cheers the sad, revives the old, inspires the young, and makes weariness forget his toil." - Lord Byron.

Mixing the two shouldn't make you sick and they don't interact. So, the famous rhyme that you've heard from others doesn't actually have any scientific basis. The caveat to that is the amount of alcohol you're drinking.

Though the difference in alcohol content might lead to impaired judgment or an underestimation of alcohol consumption, there is no reaction between two different drinks that will compound its effect beyond its base alcohol content.