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20. J-Lo's Cameo - Anaconda

Though the marketing for the Anaconda meta-reboot freely spoiled that original star Ice Cube had a "surprise" supporting role, this ultimately allowed the filmmakers to keep the bigger shocker firmly under wraps - a cameo from Cube's legacy co-star Jennifer Lopez.

While J-Lo - who played protagonist Terri Flores in the 1997 film - is briefly mentioned when Doug (Jack Black) and Griff (Paul Rudd) encounter Cube in the jungle, it seems clear that the production either couldn't afford or simply couldn't persuade J-Lo to take part in earnest.

But in a fun twist, after finally premiering his Anaconda fan film to enthusiastic reviews, Doug gets a knock at the door from none other than J-Lo, playing herself, who tells Doug she enjoyed his film and invites him to direct an actual, Sony-sanctioned Anaconda reboot.

According to director Tom Gormican, the cameo came together against the odds incredibly last minute, being shot just a month before Anaconda hit cinemas at the end of last year.