With 'reality' and 'mental' firmly selected, you affix the device on Randal and press on the backwards button. Randal had recently read a book on plant life in the Balkan Peninsula, but from last page to front Randal begins to forget everything he learned from it. He forgets the middle name of his 3rd cousin Diana, who he had met for the first time in a few years last month. His forgetting speeds up as he loses everything he knew for his associate's degree in agriculture. His long-term memory continues to burn up as many valuable life lessons of adulthood are lost, followed a few seconds later by all of high school.
Just as Randal's posture changes as he loses his maturity and sense of responsibility, you watch his girlfriend head out of the bathroom. By the time she is about 30 seconds away from their table, Randal is sitting there with the mind of a child--and a 3rd grade education in which he is still learning his multiplication tables. You almost take your finger off the button for a moment, considering that you spare the young man and give him at least a chance to re-build his adult life. But you quickly change your mind. You press further as he goes back to the mental state of a kindergartner. By the time his girlfriend is nearing his table, Randal is playing with his food--mentally a pre-schooler. She sits down at the booth next to him, putting her in the line-of-sight of the device. "Kelsi Foster, 23" it reads. You take your finger off the button so as to spare her the mental regression. Randal now sits as a grown adult with the mind of a two-year-old.
"Hey buddy," Kelsi says, gently taking the contents of the burrito out of Randal's hand, "that's not how we eat, okay?" She takes out a plastic spoon and slowly feeds him. Randal giggles and groans, wriggling around in the seat as he drools and blows spit bubbles. A fair quantity of the food ends up on his shirt, and neither he nor Kelsi seem upset by that. She diligently takes out a baby wipe and cleans his shirt off a little. Oh yes, you had noticed that her purse had quadrupled in size (and become an entirely different-looking product) during Randal's mental regression. Seeing as Kelsi is now babying him over the dinner, it is safe to assume that Randal's girlfriend of five minutes ago is now his caretaker. This would be a logical implementation of the "reality" alteration. It wouldn't make sense for a man with the mind of a toddler to be spending time alone with a woman for any reason other than that she is babysitting him. A few minutes ago, you had seen Randal watch Kelsi longingly as she walked off to the bathroom. When the two of them got home, he was probably planning on stripping her naked and having his way with her body. But, now, well... she may be seeing him naked later today, but not for the same reasons.
You continue to watch as Kelsi adjusts Randal's clothes and cleans him up a little. You slowly weave in and out of tables to get closer and listen in on their dialogue. (Well, mostly Kelsi baby-talking to Randal, who speaks in single words.) She finally stands him up and puts her bag over her shoulder as they head out of the food court--with you following behind. Randal takes in the sights and sounds of the bright lights, giant hallways and balloons. He jumps and jitters in delight at the sight of the carousel, not even considering that he could ride it--he just watches it for a while. As they sit at a bench, Kelsi takes a break by whipping out her phone for a few minutes--while making sure to keep a hand on Randal's thigh. You watch Randal directly as he looks uncomfortable for a second, before looking up and sighing with relief. A minute later, Kelsi stands him up and notices a bit of a sag in the middle of his pants. She pats his crotch for a moment, then reaches her hand down the front of his jeans. She quickly nods, and then takes him by the wrist. You follow closely behind, and watch as Kelsi leads Randal into the women's bathroom.