Just for you, scapers.
While the film's title may suggest it's about a smaller-than-normal-size Mars Bar, that's not actually the case.
In fact, the movie - directed by the guy behind The O.C and Gossip Girl - tells the tale of Wren, whose plan to attend a huge Halloween party thrown by her crush goes awry when she's put in charge of her oddball little brother.
Watch the clip below to see Wren try and scam a lift off an unsuspecting male - for what purpose, we have no idea, but girl's got game, that's for sure.
What do you recks, will you be heading to the cinema to watch this one when it comes out? Watch the trailer below while you have a think.
Fun Size is released on October 26.