You will be presented with triplets of objects, which will be assigned to the keys Z, R, and O.
In each trial, please indicate which object you think is the odd one out by pressing the corresponding key.
In other words, please choose the object that is the least similar to the other two.

Z: spark plug, R: dandelion, and O: scarf. You press <<R>>.
Z: sandbag, R: milkshake, and O: shell. You press <<R>>.
Z: fish, R: humvee, and O: parfait. You press <<R>>.
Z: puddle, R: baton, and O: roof rack. You press <<O>>.
Z: margarita, R: orange, and O: book. You press <<Z>>.
Z: horn, R: kilt, and O: gravel. You press <<R>>.
Z: gong, R: pepper, and O: uniform. You press <<R>>.
Z: breathalyzer, R: computer screen, and O: pan. You press <<O>>.
Z: coffee pot, R: leg, and O: coleslaw. You press <<R>>.
Z: flashlight, R: possum, and O: nut. You press <<Z>>.
Z: stamp, R: cockroach, and O: towel. You press <<R>>.
Z: cardigan, R: wire cutters, and O: canoe. You press <<O>>.
Z: ratchet, R: owl, and O: lobster. You press <<Z>>.
Z: fruit, R: yogurt, and O: hovercraft. You press <<O>>.
Z: twig, R: screw, and O: shower cap. You press <<Z>>.
Z: swan, R: puppet, and O: truck. You press <<R>>.
Z: wing, R: eyeliner, and O: bus. You press <<R>>.
Z: jersey, R: cushion, and O: blind. You press <<Z>>.
Z: gel, R: caramel, and O: mongoose. You press <<O>>.
Z: hairdryer, R: granola, and O: leash. You press <<R>>.