"Knock knock."

Mike looked up into the slightly worried face of Donatello.

"Who's there," he said dutifully, after a slight pause.

"I'm sorry."

Mike's face softened, and he moved to embrace his brother, but Don moved out of the way.

"No, come on, Mikey. You know how this is supposed to go. Say 'I'm sorry who?'"

Mike rolled his eyes, but did as he was told.

"I'm sorry who?"

Don jerked back like he'd been hit with an imaginary weapon, and then continued in fake death throes until he was prone on the floor twitching. Mike feared for his brother's sanity.

"Don?" he queried worriedly. "Are you okay?"

And then Don snickered. And got up and went to his workstation. Leaving Mikey feeling very confused. He was even more confused when laughter, genuine laughter, rang out from Donnie's computer area.

"Mikey, come in here, you have to see this!"

Well, he never could pass up a must-see anything, though he was hoping what he saw would give him some clue as to what the shell was going on.

There, on the biggest monitor Donnie had, was his own face, looking worried and a little weirded out. Donnie was sitting in his computer chair, giggling helplessly.

"I was thinking… you should've seen your face… and then I thought… you can!"

He doubled over with laughter. Mike felt the corners of his mouth lift in response.

"Since when do you have cameras in the lair?"

"Since always," he brother said, sobering slightly.

"You know what this means, bro," Mike said, clapping a hand on Don's shoulder. "Serious prankage time."

Don grinned back, and while Mikey didn't delude himself into thinking things would go back to the way they were before, he did allow himself the hope that they might be become something new, maybe even something… better. He'd take it one step at a time.