...when you finally figure out the name, and from thence the lyrics, of a tune you've been hearing since forever. Oftimes, the song turns out to be almost exactly unlike the mental image of it you'd formed in your head. Sometimes the two are so incongruous as to be completely absurd.
To wit: Funiculì, Funiculà. Here's Andrea Bocelli singing it. Assuming you don't speak Neapolitan, listen to the performance first, then head over to the Wikipedia page and see what this uplifting, noble tune is an ode to. =)
Jamme, jamme 'ncoppa, jamme jà,
Jamme, jamme 'ncoppa, jamme jà,
Funiculì, funiculà, funiculì, funiculà!
Jamme, jamme jà, funiculì, funiculà!