After exhaustive research my wife helped me to answer a mystery that I’m sure has had many here scratching their heads.

The mystery: Do cats prefer blue or yellow icing on cupcakes?

The experiment: My wife left two cupcakes on the counter while we ran an errand.

The result:

As you can clearly see the cats preferred the blue icing.

(Note the sample size was two cupcakes left out around two cats and will require further experimentation to be considered conclusive.)