Lucky Twins
One of the most successful films Danny DeVito was ever involved with is without a doubt Twins. Made for a budget of $15 million, it made over $216 million worldwide, and it’s a damn good thing it did.
You see, the film was directed by Ivan Reitman (who you may recognize as the director of Ghostbusters), and starred Danny DeVito and Arnold Schwarzenegger. A $15 million budget was relatively low to pay all three of them plus the rest of the film crew, so they opted to profit share instead of taking salaries. The deal was thrown together so quickly that they signed a napkin (which DeVito had framed later).
Since they opted for a profit share, the three men made a s@#tload of money off the film. Schwarzenegger has gone on record to say that the film earned him over $35 million over the years, which is more than he’s received for any of the Terminator films. Schwarzenegger has gone as far as saying it was the best decision he ever made, and I imagine DeVito has similar feelings.