Korean Switch

The act of replacing a victim's object(s) without them noticing and giving them no clue on where it's gone.

Tommy replaces Benny's phone with a case, with just the case. 20 minutes later Benny finds out that his phone is missing.
Benny: Oh no, my phone, where has it gone!?
Tommy stays quiet, knowing that he knows exactly where the phone is. (Right inside his backpack)
40 minutes later, class is about to end. It has been a frantic search for Benny's phone.
Tommy: You see Benny, to master the Korean Switch, not only does one have to switch the person's object, but also give them no clue on where it's gone. Here is your phone Benny *Gives phone over. I hope we can stay friendly acquaintances. Cheers!
Tommy leaves the room, leaving Benny with his mouth wide open, knowing that he must learn the Korean Switch, to not be constantly moving on the metaphorical treadmill of life, not moving forward, not moving back, unless of course, you run out of breath...