Cliches versus Idioms

[dukealien]

^^ Caesar even ended his life with a cliche. How unoriginal :-p

Yup, until recently a lot of semi-educated people would say "et tu, Brute"  to their assassins without getting the context/subtlety (so you're with them, too, kid).  Definitely a cliche, there.  If he'd said, "Pompey, thou art avenged" it would never have caught on.