The last line of The Maltese Falcon is frequently cited as a misquotation of a line from Shakespeare. Sam Spade, the Humphrey Bogart character, says, "The . . . uh . . . stuff that dreams are made of."
The actual quote, spoken by Prospero in The Tempest, alters in only two respects:
Here's the line spoken by the inimitable Humphrey Bogart. The delivery is so marvelous that we overlook the altered preposition and the substitution of "that" for "as":. . . . . . . . . . . . We are such stuff
As dreams are made on, and our little life
Is rounded with a sleep. (IV.i.156-58)
Links: The Film at IMDB.