Jimmy opens the door to your room to find you in his body. He blinks in confusion as his dull mind struggles to process the unusual sight, and after a good long while, he finally starts to ask in his deep voice, "What--" He suddenly stops, though, and starts changing. He seems to retract, getting shorter until he reaches 5'7'', and his various oversized parts like his ears and his feet shrink down too. On the other hand, his hair gets longer until it reaches past his ears, and darkens into a shade of brown. His skin tans slightly, his freckles fade away, and his face changes. In short order, he looks like you, though dressed in comically oversized clothes. You feel another wave of disorientation like the vertigo you felt before, and then Jimmy, in your body, is suddenly wearing the same shirt and jeans that you are wearing... or were wearing, rather. You look down and find that you are now wearing Jimmy's clothes, which fit your new body. Jimmy-as-you seems to unfreeze and continues his question in your higher voice, "--are you doing in my room?"
"Uh..." This time it's your turn to be confused, rather than excited or scared like you were before. What's happening? Does Jimmy think he's you? You try to think of something to say to him, but thinking is suddenly a lot harder. Your brain feels thicker and slower. What were you doing in Mike's room, anyway? Wait, Mike's room? Aren't you Mike? You remember being Mike... but you realize that you can also remember being Jimmy, new memories of your ginger friend's (self's?) life swirling around in the back of your duller mind, though you can't bring them to the front to recall any specifics. So are you Jimmy or Mike? You feel like Jimmy. You think like Jimmy, meaning that you don't think much. You certainly look like Jimmy--spotting yourself in the mirror, you see the same tall, lanky ginger that you always(?) see. But you still know that you were Mike before putting on the magic socks. But how can you be Mike when Mike is standing right there in front of you?
Speaking of which, Mike (Jimmy?) waves his hand in front of your face. "Anybody home?" You haven't answered his question about why you were in his (your?) room, so you finally answer, "Uh, just looking around." As usual he chuckles at your dim-wittedness, and as usual you smile and laugh along with him. Except usually it's the other way around, isn't it? "Anyway, I got more soda," Mike/Jimmy says, "so come back to the TV so I can keep on whupping your ass in CoD." You grin and reply, "Bring it, shorty." You would still love to play video games with your best friend, even if you're your best friend and your best friend is you. As you leave his/your room your thoughts become clearer, though they remain slow. You wanted a growth spurt, and now that you're your tall friend you certainly got one, and you're already feeling used to it like you've always been Jimmy. Haven't you? Do you want to stay like this, even if it means being dumb? Even if you want to change back, will you be able to?