I really love the concept of Tim hiding in small spaces randomly, and his family just completely accepting this as normal behavior.
Like,
Dick, mid conversation with Wally, grabs a cookie from his plate and reaches behind the couch, sticking his arm down there and pulls it up with no cookie. He doesn't falter once in his conversation.
Wally blinks in confusion a few times and then carefully asks, "Did you just... put a cookie behind the couch?"
Dick blinks as well. "Tim is behind there." He said like that should be obvious.
"What?! Dude, has he been listening to our conversation??"
"Nah, he's got his headphones on." Dick says dismissively.
Tim reaches his hand up and taps Dick on the shoulder to get his attention and then mimes writing. Dick hands him a pen.
"This happens all the time, doesn't it?" Wally asked, amused.
Dick snorts and nods. "Are you really surprised? I mean, I hang upside down when i need to think, Damian cuts things, Jason shoots things, Bruce broods. Tim hides."
Wally laughs. "Fair enough, man."
Or,
Mid Justice League meeting, Bruce looks under the desk he's at, grunts and motions to the side of his head. Then, he grumbles "Notepad." A second passes, he straightens up and starts scribbling something onto a notepad.
"What the hell just happened?" Hal asks bluntly.
"Red Robin is under there." Clark says immediately, used to this whole thing.
"Okay... Is there, like, a reason for that?"
Bruce grunts, and Clark says, "He likes it under there."
"Ooookkaayyyy then."
