Producers have to adhere to a strict budget and milestone timeline to get their film completed per studio standards, and if a film seems like it's going over budget they pull the plug and move on to the next project.
But many crafty filmmakers have figured out ways to work around budget constraints, and their movie making on the cheap became the stuff of Hollywood legend.
Take the Monty Python crew for instance- they wanted to have real life horses in Monty Python and the Holy Grail, but they were shooting on a budget and simply could not afford them.
So they resurrected an old time foley trick and turned two coconut halves into the clop of a horse's hooves, and one of the most iconic gags in comedy history was born.
Read 7 Times Being Totally Cheap Resulted In Movie Magic here