Prefacing by saying that I'm not in the market for a custom at the moment, had a dream last night and now I'm curious.
Said dream consisted of my fiance voluntarily going for a swim in this one dress she's worn in the shower a few times. All of a sudden, the setting changes from wherever we were beforehand to a public fountain. She (understandably) freaks out because her dress is soaked, starts crying, runs into a nearby store, tells me to stay outside, and then shortly thereafter emerges, completely dry in a different dress.
Custom would be similar, with some obvious changes. Something like: Jane is meeting a gal pal on a sweltering summer day, when she walks by a fountain. The heat and and need to cool off overtakes her, and she hops in the fountain, dress and all.
Optional: She gets out and doesn't want to bail, so she runs into a nearby store (thinking something like a target or a Walmart where you can grab something and then self checkout to avoid having someone involuntarily being in the video. At this point, the scene switches to her filming herself walking through the store, trying on clothes, etc. Customer would obviously cover the costs of the new outfit and the towel (so she's not soaking wet while trying on clothes), etc.