Despite the frequently gigantic and bloated budgets of Hollywood movies, there are always attempts to save a little bit of money going on behind the scenes. Building props and sets out of cleverly disguised household items is a frequently employed trick that works to great effect, such as the old camera flash that became Luke Skywalker's lightsaber or the store-bought coffee grinder that powers Emmett Brown's futuristic Delorean.
Sometimes, however, filmmakers will go that step further and simply re-use props from previous works rather than create their own. For some reason, every single film character seems to read the exact same newspaper. Whilst frequently a cost-saving exercise, this may in fact be to pay deliberate homage, such as when Mel Brooks deliberate sought out the laboratory props from 1931's Frankenstein for his affectionate 1974 parody Young Frankenstein - something that would inevitably have cost much more than simply constructing similar looking props.
Interestingly, science fiction seems to be one of the most frequent offenders when it comes to retooling existing props, sometimes even going so far as to dig them straight out of the toy box without so much as a lick of paint to disguise their obvious similarity to a previous use.
Whether it's a respectful bit of homage, a cost-cutting exercise or just plain laziness, here are some of the most notable examples in sci-fi.