Woe is me
The blind leading the blind
Break A leg
You can lead a whore to culture but you can't make her think
Yada yada
What's up Doc?
Verbosity leads to unclear, inarticulate things
Throw in the towel
That's all folks!
Talk to the hand
You've got to be kidding!
Yucky
A little knowledge is a dangerous thing
Tell it to the marines
Abandon all hope ye who enter here
Hasta la vista, baby
Et tu, Brute
Elvis has left the building