Clical music's most over-exposed pieces?

I'm surprised that no one's mentioned Beethoven's 9th yet. Fourth movement, choral finale, "Ode to Joy." And since we're not talking simply about just clical composers, because you've definitely added a handful of romantic and impressionistic composers, Bach's Toccata and Fugue in D minor. Tchaikovsky's Nutcracker Suite (Dance of the Reed Pipes especially) and 1812 Overture. I'm sure there are plenty more, but these are the leading offenders.