The Incompatible Food Triad is a culinary puzzle: Name three foods such that any two of them go together, but all three do not.

The puzzle originated with University of Pittsburgh philosopher Wilfrid Sellars, and some notable thinkers have taken a crack at it. Physicist Richard Feynman thought he’d stumbled onto a solution when he accidentally asked for milk and lemon in his tea (ick), but this doesn’t quite work, as one of the “good” pairs (milk and lemon) is bad.

Best attempts so far: salted cucumbers, sugar, yogurt; orange juice, gin, tonic. Honorable mention: “Get pregnant, and you can eat anything.”