Something Ryou has most likely done multiple times: Carefully taken apart a car/vehicle/other mechanical thing and organized its parts, basically telling its owner "fuck you" because they crossed him in some unredeemable way, like not pay him. /Something Shiro has most likely done multiple times: Support Ryou's brand of revenge by meticulously keeping records of that shit because no one disrespects Ryou like that and gets away with it.
oh, nonnie, he would be so talented at that. Ryou strikes me as fairly chill most times so I can’t imagine what someone would do that would merit him doing that to someone (probably they messed with Shiro in some way that Shiro shrugged off but like hell is Ryou going to do the same) but I can see him sticking around afterward, leaning against a wall most likely, so that he got full credit for it and could explain exactly why he’d done it in the first place, every single piece down to the separate wires all laid out in size order on a nice white sheet in the middle of the garage. Ryou probably has eyes that burn like ice if he gets a real glare going on (I imagine Takashi’s do too but I also suspect Taka’s ‘I’m disappointed in you’ is more devastating by far than anything else he could ever do or say to someone).
I also imagine Ryou gave his instructor’s mild heart attacks the first year or so at the Garrison when he’d, yet again, evaded curfew and sneak into the motor pool to take something Very Expensive And High Tech apart and was still in the middle of it the next morning when they found him. When he was far enough along in the course, they probably just immediately handed all their new vehicles, etc over to him right off the bat because it was easier than trying to keep them a secret. Taka test drives the new rides, Ryou takes them apart and puts them back together better. (’what are those?’ ‘pieces I didn’t need’ ‘but... those were in the pod’s engine originally’ ‘yep.’ ‘o..... kay?’)