After the first week living in Avengers Tower, Clint takes all Tony's favorite mugs and puts them on the highest shelf in the cabinet. The next morning, Tony opens the cabinet, blinks when the mugs aren't where he put them, then steps up seemingly into the air and grabs one from the new shelf. "Don't rearrange things people want when they aren't awake yet, it's rude," he mumbles as he goes to the coffee maker.
The second morning, Clint is watching Tony's feet instead of his face and sees the paper thin sheet slide out from between two drawers and retract as soon as he steps off of it. When he asks, Tony explains that it's the same motion controlled system he uses in his workshop and the Malibu house.
"I built this tower, and designed this space for common use, including mine? Did you think I would include storage space I couldn't get at just to look complete?"
Once Clint gets over the burn of not even having his prank noticed, he enjoys being able to easily reach the backs of the top cabinets.