I am physically incapable of passing through the keyboard section of an electronics store without stopping to play The Chop Waltz or Fur Elise. That's all that remains of my two years of piano lessons. I toy with the idea of starting up again but the thought of picking my way through Twinkle, Twinkle, Little Star and When the Saints Go Marching In several dozen times each isn't really appealing. I'm sure that my neighbors appreciate my laziness.
I don't trust people that don't sing with the radio. The same thing applies to people that don't yell out answers while watching Jeopardy. And, no, it doesn't count if you don't phrase it as a question.