How to "lose weight" over night...?

this is by far probably one of the dumbest sounding questions i'll ever ask but.... i'm going to the beach tomorrow. i have a pretty fit body but i was wondering if there is anything i can do to visibly make me look thinner. something i should drink or anything.. i realize that nothing i do will be a permanent weight loss because im going tomorrow but maybe someone knows a little trick that made them a look a pound lighter the morning after haha :) you can make fun of me and say that's impossible but maybe someone knows something :)